Poo poo on whoever told you a G38 or G26 was a bad choice. Want some trouble? Get a Evo GT-26. Do a search on Evolution engines on this forum...do yourself a favor and do some research. Use your Zenoah engines and let the guys pushing other engines use them themselves. Zenoahs are very reliable...I know...I own several.
FYI...I'd put the G26 on it - if it comes out 15 - 16 pounds you'll have a blast doing scale-like aerobatics.