If the rumors of the GTX series being retired entirely are true, we can't expect successors in the RTX series to have the same naming tier. Remember, the GTX 1660 (and Ti) were a clear step below the RTX 2060, despite both being xx60 tier cards.. Ampere also generally seems to increase power draws at each naming level, at least with current SKUs. So, if there's an RTX 3050, it's far more likely to be meant to succeed the GTX 1660 (or Ti) than the 1650 (Ti/Super), and a 120W TBP sounds likely as such. For a 1650 (Ti) successor, I guess we'll see if Nvidia brings back the xx40 naming tier this go around - if not, they'll have a tough time fitting in all the performance and power draw tiers given how wide their GPU stack is looking. Or maybe they'll actually update the xx30 tier this go around? IMO there'd be room for both if they actually made a low-end Ampere die, say at $100 and $150 and 50 and 75W.
That sounds like you are having some actual compatibility issues between the GPU and monitor. Not unheard of when using an FS monitor and a Geforce GPU, but more of a consequence of Nvidia really not wanting to spend engineering resources on monitors where they aren't getting a cut. Still a shame though, as the smoothness of 75Hz is definitely noticeably improved over 60Hz.
By how much? You still lost ~13% of your performance increase by power limiting it, so it can't have been throttling that hard. I guess it depends what you're after (if the lower temperature lets you run your fans slower, for example), but if performance is a goal I would let the card regulate itself. 83C even if throttling isn't damaging anything, and you clearly aren't losing performance from it.