Calvin Cooledge,
Welcome back. I'm sort of an invisible man myself. Sometimes that's a good thing.

I've got only 200 rounds of GDHP ammo to get rid of.....and a lifetime supply of SuperLube.

I just got off the phone with Maria at Rohrbaugh because there's a lot of information in other threads about lubrication, recoil springs, grip screws, etc. A lot of that information is wrong.
FWIW: Maria said that anyone with questions should call her directly and she'll answer them or get the answer if she doesn't know.
Ammo: Karl R. carries Winchester Silvertips. (So do I, as they've been 100% reliable. I started having feed problems with GDHP @ about 250 rounds.)
Grease: Rohrbaugh is now using the Hornady lube because he found a lot of the returned guns had too much Superlube grease. But if you are satisfied with SuperLube, there is no reason to switch. (I've switched to Brian Enos' SLIDE GLIDE and feel it works better than SuperLube. It was designed specifically for 1911 guns. I've been using it for a few years on my other autoloaders.)
Oil: Any good quality gun oil is fine. Rohrbaugh has stopped recommending Mobil 1 because the grade originally suggested is no longer offered. (I have a quart - enough for 500 years.)
Recoil Spring: The recommendation is still 200-250 rounds before changing spring. There has NOT been a spec change on the spring. Rohrbaugh doesn't recommend changing the guide rod assy as a normal maintenance item.
Grip Screws: They have NOT gone to a harder screw. About 4 weeks ago they got a new batch of screws in that take a 1.5 mm allen wrench instead of 1/16". Rather than hold up shipment of finished guns to dealers, Rohrbaugh decided to ship guns with the metric hex screws and send replacement screws to new owners when they get a batch of 1/6" hex screws in. This was a supplier goof and it takes a little time to get new stock set up & run off. When they turn the screw making machine, they make thousands of the little buggers.