At your weight you should have proper muscular development in your traps and upper back to make a great painless place to hold the bar, definitely get those shoulder blades back a bit to increase this "platform".
But it also comes down to you mentally remembering not to push so hard on the bar, when i first started using straps, I was hurting my forearms even more than without them, because I wasnt allowing my grip to weaken, instead i gripped harder because the straps added circumfrence to the bar.
I garuntee alot of it is a mind game, dont use your arms more than is necessary.