I just went on my merry way as soon as I read the first post. I've kept my mouth shut until now. I'm not claiming to be an expert, but anything more than an 18.5 lb spring in a 1911 is usually not a good thing, unless you're shooting some super hot handloads.
Solving a gun's problems by overiding the true cause is like taking a pain killer for your bad knees so that you can perform better on the basketball court. Sooner or later your inproper fix wears off, and you have to correct it the right way anyway. Hopefully you don't end up causing more damage.
The other guys have it right by saying that yor choice of spring is excessive. Also, saying that you have a FTF due to limp or weak wristing is silly. Any properly set up 1911 will run all day long with the least amount of grip. I test all the 1911s I work on with barely enough grip to keep it from flying out of my hands. If a gun FTFs when limp wristed, it's because it has feed issues. The simple fact is that your extractor tension is most likely too strong. There could be one or more other causes too.