Welcome to the gang! I agree that you will have much better luck with the 1916s out of the 45# bow. I'm not much of a fan of fat aluminum arrows either, so I wouldn't go over a 2016 or maybe 2018 out of the 55#er either. That's more personal preference than anything else though.
I shoot mostly carbons lately. ICS Bowhunters are no more expensive than aluminum, they are quieter, and easier to front load (get as much weight toward the point as you can). Front loading gives better arrow flight and penetration as a rule.
As to the bow quiver question. As KirkII said, as long as you keep the mounting points as close to the riser (in the fades, not the working part of the limb) there should be no negative effects. Some bows even shoot quieter with a quiver attached. Obviously the weight and balance will change, which can effect your accuracy. Practice with the quiver on and loaded with hunting weight arrows - minus one - and you will soon be shooting as good or better as with a bare bow.
I'm not familiar with Ragim bows, so I can't suggest a quiver. I would recommend trying as many as you can on your bow before you buy, or you will end up like many of us with quite a collection.
My rule of thumb is to balance the quiver to the bow. I use a very light Eagle Flight quiver on my Kanati, which is a very lightweight bow. I use a heavier Thunderhorn Linx quiver on my Orion, which is probably twice as heavy as the Kanati. The Linx sucked on the Kanati, but I love it on the Orion. I like that I can slip the Linx off when turkey hunting from a blind, so I don't have to worry about scraping fletching against something and making noise at the wrong time.
I have a Selway limb bolt quiver on my three piece Badger, the heaviest bow I own. It is a fairly light quiver. The Badger is heavy enough to begin with.
Hope this helps!