RE: adding weight?
Crazy nick your se will fly fine with the added weight so go fly and find out if you can shed some of that weight later by fine tuning your cog. If you are a sport flyer you may well be happy with the performance, but at 7 lbs without fuel it is not going to beunlimited vertical/hover machine (yes you can hover a extra).,
If you cant loose any of the weight and want more performancethen later when your flight skills/comfort with this model improve ditch the weight and evolution 46 engine and fit60 size engine, hover and unlimited vertical for sure.
I have a irvine 53 in mine, great combo.