Agreed. A close grip increses the tightness of your torso and also enables you to manipulate your elbows more during the lift in order to straighthen the back and get more thrust from the hips. I never, ever do thumbless grip though, on any exercise. This because it´s an illegal grip in the IPF and flat out stupid in most movements (like benchpress, overhead presses etc) but I guess it´s ok on squats.
Regarding the wristwraps I consider then a necessity if you´re like me, a low rider. The strain on the wrist can be quite severe and why risk an easily aviodable injury? With that said I must also point out that I strongly belive that the wristwraps should not be overused or else you will be missing out on developing stronger wrists.
I personally do not start using the wristwraps untill I´m above 230kg or more in the squat but if I tried my raw max of 270kg without them, I´m sure my wrist would get hurt.
Am I making any sense? :run: