3080 LHR at 49M – is this maxed out? 1515 core +1630 memory worth it?

I'm brand new to mining and have an LHR crippled 3080 under NiceHash. I've found with my limited experience it makes more money mining KAWPOW instead of ethash even with the NBMiner update partial speed unlock.

I'm a bit confused about the varying core and memory OC numbers I see quoted on posts so was looking for comments/advice on my numbers and set up. See pic but in short I've gotten it to just shy of 50M with voltage curve locked 1515 core, +1630 on mem, and a power draw of around 295Watts. Case open, fans at 75% give memory temps of 88 to 90.

The memory OC seems very high but it gets me a couple of percent more – at +1200 with no other changes I am getting 47.5M, so almost 5% less.

If I bump the core to 1575 and keep memory at +1630 I don't seem to get an increase in hashrate, still around 49.5M and with a slightly higher 300Watt draw.

Am I at the limit for this card?