Hello all,
quick support today

Webchain and Hycon: no support yet. I know they got more popular after the support added into Srb, but i chose to focus on the CPU-friendly algos first (Masari and Turtle), as my miner is a mixed CPU/GPU miner. Webchain and Hycon are not special, except they use a pedantically different netcode than others.

@pbfarmer :
Your new data are easier to understand.
The missing hashrate being equal to CPU is coincidental, pause your CPU and you'll see a drop will remain.
The optimal yield you can get is ~99% (100% minus the fees) but depending on your pool aggressiveness, ping and overall CPU usage you may experience lower hashrate, while 96% is somehow in the lower bound. Mining with CPU + GPU has a normally little impact on performance, but it looks like on your rig, it's higher. Maybe because of the chipset or something, or the PCIe lanes used causes some internal delays.
Try to mine with 1 and 0 Cpu and i expect you'll get a better efficiency between the instant and effective hashrate. I already experienced such on one of my rig (a A320 + ryzen). Also remove the --legacy parameter if you use it, while it may provide more stable hashrate, it tends to lower the efficiency of mixed mining.

It's very possible you get different results with another mixed miner like Stak all-in-one, just because we did different choices in term of CPU/GPU sync and netcode aggressiveness. I chose a medium/high aggressivity, but not maximum, to keep a stable hashrate and zero bad shares. It may not be the best choice in term of absolute perf on your precise rig, but that's an overall all-around design.

RX 4G on Heavy/Tube:
try this as a base, for one card

Then try to increase multi_hash by steps of 16