I'm a buyer not builder.   Reading the post re horiz stab incidence with great interest.   With 2 in seats modest baggage,  down elevator is required at speed.   Looking back at horns-looks like several degrees down elevator.   I plan to check horiz stab incidence per procedure yesterday,  but short of using a saws-all and glass,  what can I do if  the stab incidence is not correct?   I know the down elevator must be causing me drag would like to correct with out saws-all,  is there another fix (flap reflex?? etc.)   Also, at speed need left rudder to keep ball centered.  I will play with trim tab this week.  Any other  ideas?   Also,  having intermittent transponder problem.  Seems to always have problems with SOCAL in LA basin,  but other radar environments sometimes have a problem sometimes not.  Go figure.  I have reply light flashing but they can't see me - other times no reply light.  Tried cycling etc.   Current transponder is a King KT76C.  Internal antenna.  Don't know about required matching transformer yet.    Going into the shop this morning for trxpd checks.  Plan to check frequency and power and check for matching transformer.  But my mechanic says that he has had very limited / no success with "internal" antenna on other composites.   Any list experience with internal antenna? Any suggestions on where internal antenna might be located?   Thanks a lot.  Really appreciate help from the list.   Purchased AC last spring,  but haven't flown it much due to taking it out of CA to avoid the sales tax (9.5%  !!!).  Plan to start flying a lot more and resolving these issues.   Wayne Bailey 310-567-6877   N10RD LNC2 360