With the added wing I think you will want more tail authority.
I like your landing gear set up, looks strong.
I went back through this post and saw you have an extended fuselage, either tail feathers should work OK. The main difference is that the extra elevator will help...,..some. Since it is experimental and your welding is excellent modifying the tail feathers will save cost and accomplish the same.
I did the Lycon port and polish and enjoyed the boost in HP. I would recomend going to the higher compression pistons. These stretch mods add weight and often end up under powered. Putting in 8.5 pistons is little cost and well worth it. I have heard there are some experimental 0320 high compression with out the banana plates, check out what their experiences.
My Bushmaster project 0320 is capable of putting out 180 HP.