Ryzen 3600 boost speeds

TL;DR
X570 Phantom Gaming 4, Ryzen R5 3600 not hitting boost speeds. What gives?

On and off I have been spending about 2 months tinkering with Ryzen CPU. But, currently in a heat wave (no AC) I decided that heat (and fan noise as a bonus) was the enemy, so I reconsidered the stable all core OC i had the machine running.

Reset board to defaults, but reloaded XMP, left everything default/auto and used Ryzen master to limit the cpu to 44 watts. Unsurprisingly, this cost me a lot of R20 performance for multicore but that's kind of the point. I saw that the cpu for single core only boosted to around 4ghz with power (and PLENTY of thermal) budgets still to spare, which landed me at around 460-465 single core. Which is 'fine' but I was wondering if I could crank the 'juice' to have it boost single core boosts further. Mainly a gaming machine, after all.

Maxing out all power sliders, double checking everything in the bios was left auto/stock allowed it to boost to 4.05 roughly. *technically* better but not really the earth shattering improvements I was looking for.

Updated to newest bios (3.10) and now it boosts to 4.1 very infrequently but on average is now lower than before, (also the ram XMP profile I've been using so far stopped working, but that's a separate issue).

Do I keep poking the board/cpu with a stick until something interesting happens, is there obvious settings I'm missing, or can the mobo/cpu combo simply not do this?

(Side note, cpu will happily run 4,3 at decent voltages and be completely p95 stable. Also 4,4 is stable but it overheats in p95).

Other than going back to all core OC'ing (through BIOS) I've no idea how I'm supposed to get the speeds out of the cpu that it's meant to do.