Set your travel adj to 125% in both directions on the elevator and whatever direction on the rudder the lights require.

The analog trims just tip the travel, that's how the MFU recognizes you want to fire, instead of just full speed elevation. The DX6i allows you to increase it without using trims, very easy. Plus, you'll never need to adjust trim while driving, just hit it full up. If you find it too sensitive, back off the percentage until it fires as you want it.