I have tweaked again the TARSYN system so it drifts less for normal flight maneuvers (bank < 60°, g < 2.3) but the reality is the system drifts if you pull more than this. The gyros also precess in a turn, even at 1 g, though I did tweak this as well.
I have actually increased the drift rate of heading gyro as it wasn't sufficient, but again for normal flight it should be OK.
Best regards,
Tango.