RE: Bizarre plane behavior
A C/L flite streak balanced on the spar is a wild ride and doesn't need much throw at all. To reduce twitchiness, most people would prefer a C/G about halfway between the LE and spar.
Check the incidence of the fixed horizontal stab too. Negative incidence would be very bad. A touch of positive incidence (droopy tail) is acceptable and is often used to equalize inside/outside turning performance.