I'm currently shooting 30 inch 2512's with 250 grain points off a springsteel 1 rest. I did not have a 12 blade but had an 8 and a 10. Currently I'm shooting with the 8 and 10 stacked. Not sure if this is a good idea or not. Seems to work ok. Anyway, I'm getting ready to build some 2712's and am wondering if this set up would still be ok with the 27's and 300 grains up front.