Let me ask you this question and it is paraphrased from one asked me when I wanted to trade up to a "better" carry pistol.
"What problems are you trying to resolve by buying a better scope?"
Spend your money how you like, but if you are happy with the performance you are getting, then you may be disappointed when the performance of the new scope doesn't yield you better returns. Keep in mind that getting a low end good brand scope may not actually be a significant change and buying high end glass may yield you a prettier view, but not actually improve your ability to hunt. Where it really shines is in making out details at longer ranges, something you probably don't need it for given where and what you hunt.
Of course, that is all "need" logic. If you want to put a really good scope on your rifle because you just want to, that is fine as well. The only time people seem to complain about buying high quality gear is when they pay for it or when they drop it. You don't often hear people complaining about how they could see a deer too good with a high quality scope, but people do complain about not seeing well enough with poor quality scopes. Given that your scope is working for you, you don't seem to be complaining about it either.