More info please
When you say that it seems too tight, how do you mean that exactly? How does the gun function? Is it reliable with the current recoil spring? Are you using the sling shot method of retracting the slide or the overhand method?
I haven't done any research on different springs for the TCP. No help there.
Have you cleaned and lubed the frame rails?
A light spring in a polymer gun will cause the slide to batter the frame in many cases.
Last edited by Arkhog; November 3, 2012 at 10:53 PM.
Reason: Additional thought