Thanks for all of the great advice!!
The belt is brand new and clean as can be, but I will try the alcohol trick and, failing that, either swap out the belt to see if it persist or see if I can locate a product that might aid in "grip". I have tried giving the platter a little spin before turning on the motor, but I really need the extra hand to stabilize the motor while pressing the power button because, for good or for bad, the motor sits freely on the cabinet below the plinth for isolation purposes, but it moves very easily and will inevitably wind up touching the plinth if I don't hold it in place. Annoying, I know.
I do have a dust cover - I paid a premium for Uncle Kevin's museum-quality clear vue dust cover. I have to say, however, that it's truly stunning. The green edge looks like real glass and it's an impressive piece of...well....plastic!
I'll check the alignment again and reset the anti-skate. I don't have a record cleaning "system". For right now, I'm just using a record doctor brush. All of my vinyl is new, so it should be relatively clean, just need to keep the dust off. But it sounds like I'm going to also need to invest in an ultrasonic cleaner? I'll read through the forums and see what you all think of these $400-500 jobbies coming out of China.
I've always loved Audio Research and have owned several of their amps and preamps, so it stands to reason that one of their phono stages would be equally impressive.
I guess I just figured that something like the iFi or MoFi (sub $500) phono preamps would sound "good" if not amazing. It just makes me wonder what some of these YouTube reviewers actually hear - because as many of you know, the iFi received RAVE reviews and was touted as a true "giant killer". But alas....it seems that, perhaps, you get what you pay for after all. I should have known better.
My path forward will be to double-check my cartridge alignment, see if I can rectify the belt slippage by swapping it out, and start with replacing the phono preamp with something appreciably better - perhaps ARC. I'll look into the ASR Mini Basis Exclusive. Any other phono preamp recommendations?