The center pin on the 510 seems good, nice and springy but not overly soft. This mods been a nightmare honestly... I even popped it open and looked at the 510 on my initial problem and it looked fine to me.
Note: idk if that is the actual resistance, I tried the normal .007 and it still didn't read or perform correctly, I read on another forum that a guy with the same problem had an IR of .12 and it fixed his problem. I just don't have a calibration tool atm