i finally connected my 2 r909 pod miners to my existing setup today

on the picture you can see the two new r909 and on top of it a gekoo usb hub with another 3 compacf sticks. i have 3 more compacf miners, but since my rpi4 has no usb-port left, they can't be used now and in addition one of the usb hubs almost died (one usb pair still works)...

the whole fun consumes now ~250watt and the r909 fans are very quiet in my opinion

and this is how the whole thing looks like at the moment:
cgminer version 4.12.1 - Started: [2022-12-22 17:14:20.873]
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(5s):4.787T (1m):4.870T (5m):4.807T (15m):4.773T (avg):4.706Th/s
A:6051658 R:0 HW:2768 WU:65748.6/m
Connected to solo.ckpool.org diff 3.08K with stratum as user cygan
Block: 7034e12b... Diff:35.4T Started: [18:46:51.507] Best share: 3.88M
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[U]SB management [P]ool management [S]ettings [D]isplay options [Q]uit
0: GSF 10051796: BM1397:01+ 525.00MHz T:525 P:525 (24:12) | 100% WU:100% | 373.6G / 319.3Gh/s WU: 4460.3/m
1: GSF 10051619: BM1397:01+ 525.00MHz T:525 P:525 (24:12) | 100% WU:100% | 351.5G / 351.7Gh/s WU: 4913.7/m
2: GSF 10053622: BM1397:01+ 525.00MHz T:525 P:525 (24:12) | 100% WU:100% | 357.5G / 342.6Gh/s WU: 4786.4/m
3: GSF 10070003: BM1397:06+ 525.00MHz T:515 P:523 (4:2) | 88.7% WU:^83% | 1.785T / 1.760Th/s WU:24588.4/m
4: GSF 10070009: BM1397:06+ 525.00MHz T:525 P:513 (4:2) | 91.7% WU: 91% | 1.968T / 1.932Th/s WU:26999.8/m
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and here is the usage of the rpi4:

do you see any potential for improvement in performance?