I had Titan spring in my TX200HC fitted for about 3 weeks.. but I found it working better as a doorstop..
Now my TX have standard piston, and "special" Polish tunning - http://images62.fotosik.pl/781/3b7de5d8757f6adf.jpg
on chrono 10 shoots had min 218m/s max 221m/s .. but average 219m/s with spread within 1m/s..
Stroke is short as my.. Is very short, and allowing me to hit 25mm target at 55Y 7/10 if is no wind..
But.. those three misses are caused by my crapsky shooting..
I can see it on comps.. All of my missed shoots was my errors.. judging distance and shooting skills..
I tell You what.. If You can pop up to Keighley this Sunday, You can shoot my TX and d find what Im talking about, or, alternatively, just find me in Ponty some weekend..
And then.. I can tell You how to get Your TX done ..