I have a Hornady manual. It shows TG running from 5.0 to 5.6 grains with their 200gn XTP. OAL of 1.210". So you are at a good starting point.
True. But it would seem that train has already left the station. TiteGroup is not my propellant of choice for beginners. It's really spunky and can be unforgiving. But there is some saving grace here: You're loading 45 ACP - which is a low-pressure chambering - which affords some forgiveness, compared to high pressure rounds (like 10mm or 357 Mag). And when it comes to burn rate, in as sense, 45 ACP "shifts" a propellant's burn rate slightly slower (oversimplification). 45 ACP is a bit of a wild card that way. Also, you're loading fairly light bullets - which also allows some forgiveness. So all together, I'm not too concerned. You're numbers look good. That said, for beginners, I usually recommend intermediate burn rate propellants. But as I already mentioned, that train has left the station.
In my first post, I chose to leave that one alone. But it's out now. "+P" is a term that is often used rather nebulously. But yeah, it's about pressure. And isn't about the bullet you're loading (or this thread in general).