I'll certainly agree magazines are a primary source of malfunction in a semi-auto pistol.
However,this is a controlled round feed 1911.
The case head must climb up the bolt face under the extractor for cycling to complete.That short,fat cartridge must rise up at a significant angle.The forward face of the rim contacts the extractor hook as an incline.For it to smoothly transition under the hook,a little hand crafted leade in can be necessary on the lower edge of the hook.
The extractor is also deflected outward by the brass rim in a three oclock direction.If it is a sharp edge on the underside of the extractor that engages the OD of the brass rim,,there is a hangup.
If the bolt face has any high spots,these can be a problem,too.Easily floated off with some light stone work,just knocking off the high spots.
If you prefer not to click links,go on youtube and search "1911 extractor tuning" There is a vid by Wilson Combat that shows the file work.
Its a very small job that just needs to be done right.
There are a few vids on extractor tension.
Excessive extractor tension can make it hard for the round to climb the bolt face.Insufficient extractor tension can cause FTE's,or the brass not being controlled enough to eject properly.It is one source of stovepipes.
Tuning the extractor is routine in making a 1911 run.On a new part or new gun,its a detail that is often the culprit.
The OP observed the extractor was causing the hangup.
Some good 7 or 8 rd mags might be a great investmrent,but they don't tune the extractor if the extractor is the problem.
Pardon me for getting windy about it,but a really important first step in correcting a malfunctioning firearm is observation.Understand the cycle,and observe.
BEFORE you pick up a file or a Dremel or a hammer or your MasterCard,know what it is you need to change,and why.
That would be my suggestion