Fin placement on 7'6" big fish

Wondering how far off the rail for the forward and rear tips should be. I will be using the Futures T1 twin fins. Wanting to start glassing tonite so any quick input would be way helpful. Thanks ed

…Try a 1-1/4" off the rail on the trailing edge(back) and 1-1/2" on the leading edge(front), or 1-1/2" T.R. & 1-3/4" L.R.Herb

…Try a 1-1/4" off the rail on the trailing edge(back) and 1-1/2" on the leading edge(front), or 1-1/2" T.R. & 1-3/4" L.R.Herb