So my subfloor is going to be 1" polyisocyanurate insulation and 3/4 ply. My plan was to install it in three sections and bolt it down using two tie downs per section. But I mistakenly cut my insulation and ply from the back and moved toward the front. This resulted in the front most sections of insulation and plywood being very narrow and 3" away from the nearest tie down points. So my question is should I get another sheet of plywood to get it right or should I keep the same plywood and just attach the piece with no tie down options with self tapping screws or something similar?