Yes, all us kit builders have this "problem". The SLSA trainers have different flap detents (less down angle) which allows them to trim for 60 with full flaps. The kit flap detents are more aggressive. You can offset some, not all, of this by adjusting the HS jack screw to give more nose-up and less nose down range. I did this and it helps. Just screw in the rod end on the top of the jack screw until at full nose-up trim the leading edge HS tube almost touches the bottom of the slot in the cover plates. This gives more nose-up trim but still leaves plenty of nose-down trim.
If its not too late in your build, some guys cut a couple more detent notches in between the standard notches to give less aggressive flap choices.