I have a pair of 110's and there is about a 300 RPM difference between the two. Its been that way since I first opened the boxes regardless of setup or adjustment, so power does seem to vary a bit from engine to engine. Both are well broken in and run great.

On 30% heli and open exhaust pipes:

15x8 APC 9,800 and 10,100 (not enough prop but didn't give me a problem)
13.8x10 APC four-blade 8,900 and 9,200

I've been running the pair on my VQ P-61 Blackwidow using the 4-blade props for the past year. Full throttle on the stronger engine is adjusted to 8,900 peak to synch the engines. Look, sound and performance are awesome on the big warbird!

You can find video/sound of my 'Widow on the vqwarbirds.com website.

Walt