Mahavishnu, thanks for that illuminating paper! Just took a cursory look, and will return for a closer read later.
In AK's case, I suspect that the grip does have to do with better control over the torque, though as Srikant and I have discussed offline, there are bows of varying lengths available, so why would she prefer to grip a full-length bow further from the frog, rather than a fractionally shorter bow AT the frog? I think the groove of the frog makes it more convenient for the bow to be gripped there, rather than further along. Then again, one can be conditioned to hold any thing in any way.

For someone who enjoys the use of the entire bow, it just strikes me as a sacrifice of space available for bowing.
Bowing is something that is of prime importance in violin playing, given that much of the sound is attributable to that and fingering, but it often saddens me that CM violinists place far more importance on fingering techniques (gamakas, brighas), than they do on bowing, which almost entirely controls the timbre of one's music. It is perhaps analogous to vocalists worrying more about bringing out rAgam through a variety of gamakas than about voice culture. I know this is a valid and longstanding criticism of Carnatic vocalists, especially in contrast to their HM counterparts. It is no surprise, then, that the same attitude prevails amongst violinists.
The major takeaway from the paper you have attached, for me anyway, is the importance of bowing force in determining the brightness of the tone. According to the thesis, the high static friction (bow on string) of the bow with greater bowing force results in a brighter timbre, though there are upper limits to bowing force as well. The paper claims that the brightness of the tone directly correlates to bow-bridge distance (distance between the bow's position on the string to the bridge above it), which is definitely surprising, given I have been taught to specifically bow closer the bridge, and from my own observations of a thicker tone from violinists who bow closer to the fingerboard. The paper suggests that violinists who decide to bow closer to the bridge unconsciously use a greater bowing force which is necessary at that position, and that it is this bowing force ultimately that results in a brighter tone. It is possible, then, that violinists who bow closer to the fingerboard (and there are violinists who criminally bow ON the fingerboard, even!) tend to use a lower bowing force, and thus have a duller tone.
Many CM violinists are also not conscious about keeping their bow perpendicular to the strings while bowing, and their bow often slips up and down the strings. My recommendation is that if musicians were to all apply a greater baseline bowing force while playing, the static friction would also reduce the slippages. I have been consciously increasing my bowing force over the last several months (it is not easy after being trained to be unmindful of such things for years), and I have been amazed at how much better my technique is because of this singular improvement!
Incidentally, with all the electric violins I have heard (AK, Embar, G-K), I have found a thicker, duller timbre. I wonder if this is an unavoidable distortion of the actual sound of a violin.
Schoonderwaldt also comments on other components of the bowing technique: (a) tilt - how much the bow is angled in comparison to the string (i.e., how many hairs are in contact with the string), (b) skew (at what angle the bow is played relative to the string; a non-perpendicular bow actually generates force along the string), (c) bowing velocity, and (d) bowing position (frog to tip). The author says that (a) and (b) are merely secondary contributors to sound, and that skew can be used to manipulate bow-bridge distance.
While bow-bridge distance and bowing velocity are not as important as bowing force, they do affect the sound produced. An increasing bow-bridge distance (i.e., bowing further from the bridge, towards the fingerboard) and a decreasing bowing velocity (the bow is drawn across the strings slower) result in a better tone. These aspects can be manipulated per the musician's needs.
The author observes that these aspects of bowing are closely related to the mechanics of the way the violin is held. It would be interesting to study variables like tilt and skew in the Indian manner of playing.
As an unabashed admirer of the Narayana Iyer (TNK, Rajam) school's tone (and music in general), I have gathered from several TNK sishyas that he always emphasises bowing with great force. Indeed, the bright and pure tone of his violin is an affirmation of the conclusions of this paper.
(Sorry to hijack this thread - please move these posts to Technical Discussions if you see fit.)