I am in the process of setting up a pair of TX's (MK III) for HFT & FT disciplines. I have tried longer piston rods and also nose extensions & HW seals to achieve a shorter stroke with the goal of reducing hold sensitivity. As stand alone tweeks they were not rewarding. With V-Mach internals they are close to the competition power limit (legally here in France we have rather more leeway than the UK for airgun power so no worries there) but, very smooth and with a very small fps deviation (<4 fps over a 20 shots chrono string). I understand the logic, maths and physics of short stroking but, before I purchase two sets of new pistons and comp tubes for the requisite proper short stroke fettling does anybody have guidance to the contrary?