Hub, have you tried the glass nosed C at alt?
It's WAY better than the B-26 above 10k. The 26 is a joke at even medium alts. I haven't flown the 25 enough to lose an engine yet (er... without losing the entire wing, I mean) but the B26 couldn't keep level with 1 engine out at 14k last time it happened to me. Just too weak above 9k.
The B-25 was going strong past 15, and only starting to get weak at 18k. 1k less ord, but much better performance. That makes up for it in my book!