Hey Carl typically a tail heavy airplane is NOT going to fly long at all. symptoms include very sensitive ailerons, VERY sensitive elevators and generally poor / twitchy flying characteristics.
(symptoms are very similar if the CG is good, but the airplane has too much elevator and aileron throw.)
is it THIS ripmax ? (ARTF WOT)
http://www2.ripmax.net/Item.aspx?Ite...ry=010-010-020
the manual for that airplane specifies a CG 89 MM aft of the wing leading edge (with an EMPTY fuel tank)
Do yourself a favor, get a permanent marker and a ruler, mark a line 89 MM back on the lower side of the wing (one on each panel)
rule that part out first...
that is, ASSUMING that's the right ripmax trainer.. if not, post a link or description (or look in the manual if you have one )

great job getting 'er up and back again!