Just got a new titanium cyl. 342 that's gonna be a favorite, but the trigger pull stacks up a bunch. My M38, circa 1991, has one smooth double action pull start to finish. Is it the hammer sring or is the mechanism different? Wolff spring folks have an 8# spring to replace the factory 8.5 unit. Would this help? Also need advice on the best weight trigger rebound spring, the std. 18# is too strong. 14? 15? THANKS!