Apparently
Ok, finally got some time to reply, the bit I've highlighted would be a fair enough answer to why you use ABS off and the handbrake.
However, you then follow with a large paragraph as to why you think your driving style is faster, which would seem irrelevant if you honestly didn't care about going quickly, ignoring the fact that you're wrong anyway. Using ABS1 and keeping your thumb as far away from the handbrake button as possible, is the fastest driving style in the game with very few exceptions. There is proof of it everywhere, just look at the top times in online TTs, and virtually any online race, they will all be using ABS1 and none will be using the handbrake.
As for ABS off slowing you down faster in a straight line, I think, although I haven't bothered testing, that that is also wrong, with ABS1 you can just slam on the brakes and ease them off as you get into the corner. With ABS off you have two options, lower the brake balance and get pretty close to full brakes, or don't go anywhere near full brakes, both of which will increase the time it takes you to slow down.