really on low rates the U-Can-Do is a docile plane to fly,worth the time it is going to take patch and repair some rash.
the control surfaces need to be set so there on a low rate, it will fly like a trainer.

when I was still flying my Nextar trainer, a club member let me try his out for a spin, I was tearing the sky up on low rates,and on high even he was impressed I was having so much fun I nearly timed it out, and it slowed down nicely for landings and really floated in .

the wing on the U-C-D is really made for slow flying and 3-D not racing around,its a real floater, put a 15/4 on that ST 75 and get some local flying club help to trim it out, and have some fun on low rates if you have a computer radio then 25% low and about 70% on high to start, the lower pitch prop will give plenty of pull at a lower speed,after a few flights with some help you will be set.

it also helps to have a sim to practice on,but since you have some air time allready you will find the groove pretty quick a expierenced pilot to help you with the first jitters and any check out of your plane helps.