Made some research and a 1.5 way LSD is what race cars use generally.
Kinda like it acts like a normal diff but under torque it tightens automatically,
something like that, I think it's adjustable as to when it tightens. Also,
LSDs cure torque steers from rear wheel drive cars.

Im not into RC drifting because I dont like the idea of using plastic tyres
so I dont lock my rear diff. Street racing is what I do so traction and
stability in the straights is important plus good handling for dog fights.
But I also drift when needed. So I just want to apply some race car technology to my rc cars for better performance.

The surface we race on is typical flat street concrete with some slippery
spots because of dust or sand build-up so the condition is loose to medium
traction. When I first got my RTR TC4, its front diff is fully tightened like
a spool and after months of running, it began to have straight line issues,
it would wander left and sometimes right. But when I loosen the front diff,
it tracks straighter than ever before. Surprisingly, my TT01D with stock
gear diff runs the best on straight line, I mean you can point it to the
direction that you want and just let go of the steering wheel.

So basically, an LSD gives you grip on corners? Which will be beneficial
in quick launches, loose, tight or mildly tightened diff?