After your modification, how are your brakes ??? Your modification now keeps the secondary m/c from being raised while braking and could cause poor braking ... test ride it with caution.
On a 2whl Wing, each caliper has 3 pistons. A top, middle, and bottom. When the front brake lever is applied, the LF middle piston is activated, and the top and bottom pistons of the RF. If the front brake is activated hard enough, the secondary m/c begins to lift and then begins to activate the ADV, and the upper and lower pistons in the rear caliper.
When the rear peddle is pushed, the upper and lower pistons are activated in the LF caliper. The center piston in the RF caliper, and the center piston in the rear caliper. Because 2 pistons are activated in the LF caliper, the secondary m/c will begin to rise and activate the ADV and the other 2 pistons in the rear caliper.
Most trikes have some sort of modification in the way they link front and rear brakes. I'd recommend calling RS to see how your modification affects your brakes.