You are correct about full mags jam more mwnciboo, we had to keep mags oiled, once a week we had to unload all of our mags and re-stretch the spring. However, I fail to see what that has to do with a tactical reload. Also the only difference in a tactical reload and any other reload (as I have been taught) is the context, i.e. in a firefight. And tactical reloads usually are very fast as you don't lower your weapon. I'm really uncertain of what you're talking about reloading twice. A person would perform a tactical reload whenever there is a lull in a battle to make sure they had a full magazine. I don't know if you read the link that you posted but that guy even explains what the different types of reloads fairly clearly,
Also just to correct the tracer myth. You can load a magazine or belt up with nothing but tracers and have absolutely no issues. All a tracer is, is a round with phosphorus or magnesium at the end of the projectile. Normally we would always put a three tracers in our magazines, one at 15, one at 10 and one at 5 rounds left so that we knew we needed to reload.
Also to Death, if your magazine was empty your reload would be slower as once you loaded the new magazine you would have to ride the bolt forward which at least on the M4 could be awkward if not experienced (not sure where the bolt release is on the other game weapons). It was always advised to reload prior to emptying your magazine that way it was simple as grab new mag, drop old mag, load new mag, place old mag in pocket or vest and carry on.