First try a thin layer of Sinew that will allow u to go to 28
If that is no good,,,then put more and induce reflex,,u will gain weight and have to tiller
If that's no good,,,then grind off maple,.,Sinew back and induce reflex...one of those should work,..
If ur backing holds up as is,,,this bow is working,,,
If u pull it to 28,,.it will be close to 175
Keep in mind ,..if u Sinew...u can draw it further if need be,,.I have never put Sinew over a backing,..but seems like it would work...and I am thinking,,,.putting on the Sinew before shooting it in would give best speed,,,but am spitballing