Quite frankly, i agree righteously with what you've said here:
"mediocre perfromance of V-grooved wet weather radials is compunded by the bad road conditions in Pakistan."
What i said above was based on what i've felt & experienced during driving. Nothing theorectical. But when i shared this thing with other people they we all seemed to agree on the fact that more the number of linings better the grip and braking.
More the number of straight lines, better the braking, grip, etc.
This V type "the tread runing uninterrupted from shoulder to shoulder" actually lessens the grip, braking, cornering, etc.
Today a 40 year old guy actually totaled his new EXi on the side partition. As i was passing by i felt my ethical and moral obligation to stop by and ask him if he was hurt. When i asked him what caused you to bang the car into the side wall, he told me that the turn wasn't near it was far and when i braked, the car skidded and it went skidding on the road for about 40 feet. The 4 Wheels Dics were actually helpless when a mere push on the brake pedal caused the wheels to jam due to slippery suface underneath.
To further explain the straight line thing, consider this tyre, its better because of 4 linings that run straight throughout the tyre.
While this one isn't much better for cornering or lateral grip/braking because it has no linging apart from V linings to disperse water.