Is it possible to get a different brake pedal that sits lower? Ideally i want my lever no higher than my peg, currently it bottoms out on the frame. I've filed an amount from the bottom of the lever, but i'm still not as low as i'd like. Has anyone else come across this?

Yes you can a little.., unscrew de piston on de back..!!

Sorry, yes I can adjust the piston, I’ve done that. But it’s the pedal physically hitting the frame that is stopping me from adjusting further.

Do all TRS’s have a pedal that’s a lot higher than the peg? Do most people prefer this set-up?? On all my other Trials bikes I’ve been able to get the brake at the same height as the peg.

I think you are stuck with raising the peg profile or lowering the lever profile aka bending it. The levers do bend before braking, I have a badly bent one on one of my TRS now.