Need hints on extra tuning on the .40 1911

In an act of desperation, I have wrote Tripp an email asking for help on this. I never thought i'd receive a reply back with someone actually trying to help me, these guys are great!
I have received quite a long text, seems like 1911 reliability is entirely (or almost) dependent on magazine design.
Once I have tried and tested his advice, and with permission to copy/paste email, I will share advice and results.
 
It's a gov't length. Wolff springs suggested an 18.5 # spring. I tried an 18# in there and it worked ok. 16# works great for me. It has a ramped bbl so that may help. It's been reliable aside from the one mag. Google tuning an extractor and ensure that the corner dimension has been rounded.
 
Will look into tuning extractor.
Thing is, even with empty chamber the bullet would hit the ramp, on first round, so I know the extractor might help longer term reliability but short term I am dealing with feeding issue.
With 12# my sights track back on target, I can just imagine 16# having the front sight dive lol, but maybe that extra push helps with your feeding.

I am pretty sure my issue is near solved, it has to do with shortening feed lips on magazines (as proposed by Tripp)
Shorter lips mean round gets out faster, and being out sooner means it will be higher in the slide when it hits the feedramp.
I have a 2 videos with dummy ammo loaded, and slowly cycling the slide and letting it go gently.
On film #1 an unmodified mag, jams everytime. When cycling aggressively they chamber in, but slowly like in the film it's 100% jam.
On film #2 magazine with filed feedlips, 100% feeding reliability in slow non aggressive cycling.
They are on photobucket if anyone wants to see via PM, before and after.
400-500 Live firing on Thursday will confirm reliability.
 
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