Great Flying Firetrappe. Looks like if you turned down the throws or used expo it would be a little tamer. I always start with low or medium throws and adjust from there. I also always use a computer radio to adjust throws and expo amounts. On the regular 30" version the COG is 11 1/4" from tip of nose. The 30" will fly nice and slow when built light. I can always catch it by hand. You can check the COG in the air by doing a 45' dive but make sure you have some altitude first. Or just fly it around slow and see how it reacts. Try some power off glides also.
The original wing design was done by my friend Ken Hill at http://acesim.com/rc
,who is a great builder, designer. He has plans for the JSF foam plane on his site. I flew the JSF a few times and really liked it, that is what inspired me to build the EPP cutlass. I still will be building a JSF foamy from depron for myself.