Opinions are like ....navels. Everybody's got one.
A pretty reliable rule is "If it ain't broke,don't fix it."
1911's and clones have been made by enough different manufacturers over 110years and are enough different stages of "broke in" that the aftermarket folks are in a tough spot.
If they had "the perfect blueprint" to make the precise part John Moses intended, odds are good 1) There is a reason someone is replacing the part
2) Due to wear or tolerance stack or a mongrel gun,a "perfect part" is not exactly what is needed. The Smith wants just a little extra steel for fitting.
Don't expect 1911 upgrade parts to be "drop in" Its often more than just replacing parts.
If you do buy parts,usually Cylinder and Slide,EGW, Harrison,Brown,Wilson,etc sell parts that are better than original.
While the 1911 LOOKS about as sophisticated as a Hi-lift jack,There is a finely choreographed dance that goes on with each cycle.There is an elegance there that must be understood.
Mere mortals can work on a 1911.But you have to understand there is some subtle stuff there that is not obvious.
"Fools rush in where Angels fear to tread"
OK,there is one part on a Philippine pistol likely to be substandard,that is critical to reliability,and you can't really screw up too bad. Magazines.
I suggest you go up to the tool bar and do a search on "1911 Magazines"
You will find some to read.Not every gun/ammo combination likes every magazine variant. Even among quality magazines. Wilson,Brown,McCormick,and several others have loyal following.Buy just one and test it. If your gun likes it,buy more.
I set my Son in Law up with an ATI Philippine 1911.He takes darn good care of my Daughter and Grandkids. I'm grateful.
Now,to start with,it worked. It didn't "Need fixin".
But,stripping it down,The barrel,frame,and slide were good. I lightly stoned the feed ramp with a polishing stone. They were fit together pretty darn good.
I did not much care for the small parts. They had a Harbor Freight look. "As cast" in places I figured needed to be better.
I put in a quality slide stop(Ed Brown or WilsonI forget),and a Cylinder and slide hammer,sear,disconnect,sear spring.(A "Duty and Carry" matched set.) And I replaced the thumb safety with a stock Colt thumb safety.This stuff requires some skill and experience. Not recommended for a first time kitchen table project.
I took three 1911's with various features over to see him. He got to select what sort of beavertail ,grips,and trigger length,and mainspring housing he preferred. I restaked the plunger tube.
I had proper tools to do all this.
I staked in a Trijicon Tritium front sight and fitted a NM Harrison U-notch rear sight. I really like that combination.
I burned a couple hundred rounds through it. It ran good and hit where it looked.
I gave it to him on Father's Day, and told him I was Grateful I had happy,healthy Daughter and Grandkids.
IF you have a good local 1911 Smith,you might let him massage and tune your extractor. And always feed your ammo out of the magazine. Do not put one round in the chamber and drop the slide.
Becoming a competent 1911 mechanic is possible but its a commitment. Kuhnhusen manuals,sear jig and stones,staking tools,proper screwdrives,etc.
Making it better,making it safe has to be done right, . You might buy a $45 grip safety more than once.
For one personal 1911,its probably not worth the investment. Find a GOOD 1911 smith. Pay the man (or Woman).
Or,if you are going to do it, maybe by the time you are done,that $1500 or $2000 gun MIGHT be a bargain.
If it ain't broke....