Outer Limits 4x4 Board

I have put 3" OME springs in my 60 series and put it in for a wheel alignment. The fella who did it told me the caster was out 1 1/2 deg and this is why it tram tracks. Will putting wedges in to drop pinion like he said really make that much difference??

Shit yeah when i put my bigger springs in i couldnt keep it on the road at 60ks without it jumping away, whacked in some offset castor bushes and it drives sweet even though it is still a fair bit out.