I'm pretty new to mining zen and in general, I've been testing different pools and miners for the past week. So far, the two pools I've found as the most profitable are catspool and suprnova and the best miner for me is EWBF's (0.3.4b).

I've run into two problems, though. My main problem is pretty self-evident from the title, the fees on suprnova are extra. In the "Terms and Conditions" section under "Other", it says that the fees are 1%, which is perfectly fine. The only problem is, in my earnings, under my credit is for all time 0.05664148 and my TXFee is 0.005. I should have 0.051 in my debit, but I have 0.045. Does anyone know where the extra 0.006 is going?

My second problem is about catspool. I like catspool much more than suprnova and it gives me a better payout and less fees, but EWBF slows down extremely after it searches for new work the first or second time.

The logs will be similar to this:
+-------------------------------------------------+
|         EWBF's Zcash CUDA miner. 0.3.4b         |
+-------------------------------------------------+
INFO: Current pool: zen.catspool.org:3332
INFO: Selected pools: 1
INFO: Solver: Auto.
INFO: Devices: All.
INFO: Temperature limit: 90
INFO: Api: Disabled
---------------------------------------------------
INFO: Target: 00a0000000000000...
INFO: Detected new work: 1a235
CUDA: Device: 0 GeForce GTX 1060 3GB, 3072 MB i:64
CUDA: Device: 0 Selected solver: 0
INFO 18:53:46: GPU0 Accepted share 208ms [A:1, R:0]
INFO 18:53:47: GPU0 Accepted share 183ms [A:2, R:0]
INFO 18:53:47: GPU0 Accepted share 181ms [A:3, R:0]
INFO 18:53:48: GPU0 Accepted share 178ms [A:4, R:0]
INFO 18:53:48: GPU0 Accepted share 180ms [A:5, R:0]
INFO 18:53:52: GPU0 Accepted share 182ms [A:6, R:0]
INFO 18:53:54: GPU0 Accepted share 194ms [A:7, R:0]
INFO 18:53:55: GPU0 Accepted share 199ms [A:8, R:0]
INFO 18:53:57: GPU0 Accepted share 180ms [A:9, R:0]
INFO 18:53:57: GPU0 Accepted share 179ms [A:10, R:0]
INFO 18:53:59: GPU0 Accepted share 179ms [A:11, R:0]
INFO 18:53:59: GPU0 Accepted share 181ms [A:12, R:0]
INFO 18:54:00: GPU0 Accepted share 179ms [A:13, R:0]
INFO 18:54:00: GPU0 Accepted share 179ms [A:14, R:0]
INFO 18:54:00: GPU0 Accepted share 178ms [A:15, R:0]
INFO 18:54:03: GPU0 Accepted share 181ms [A:16, R:0]
INFO 18:54:03: GPU0 Accepted share 186ms [A:17, R:0]
INFO 18:54:04: GPU0 Accepted share 198ms [A:18, R:0]
INFO 18:54:05: GPU0 Accepted share 197ms [A:19, R:0]
INFO 18:54:06: GPU0 Accepted share 180ms [A:20, R:0]
INFO 18:54:06: GPU0 Accepted share 190ms [A:21, R:0]
Temp: GPU0: 65C
GPU0: 290 Sol/s
Total speed: 290 Sol/s
INFO 18:54:09: GPU0 Accepted share 178ms [A:22, R:0]
INFO 18:54:10: GPU0 Accepted share 182ms [A:23, R:0]
INFO 18:54:10: GPU0 Accepted share 347ms [A:24, R:0]
INFO: Detected new work: 1a236
INFO 18:54:17: GPU0 Accepted share 178ms [A:25, R:0]

[Cut to save space but it's just as it was above]
[No "detected new work" was cut, only hashrates and accepted shares]

INFO: Target: 000d555555555555...
INFO: Detected new work: 1a237
INFO 18:55:23: GPU0 Accepted share 179ms [A:81, R:0]
INFO 18:55:24: GPU0 Accepted share 186ms [A:82, R:0]
INFO 18:55:27: GPU0 Accepted share 203ms [A:83, R:0]
INFO 18:55:27: GPU0 Accepted share 185ms [A:84, R:0]
Temp: GPU0: 73C
GPU0: 284 Sol/s
Total speed: 284 Sol/s
INFO 18:56:00: GPU0 Accepted share 178ms [A:85, R:0]   
INFO: Target: 0001638e38e38e38...
INFO: Detected new work: 1a238   --from this point
Temp: GPU0: 74C
GPU0: 284 Sol/s
Total speed: 284 Sol/s
Temp: GPU0: 75C
GPU0: 279 Sol/s
Total speed: 279 Sol/s   --to this point is about 2 minutes

Anyone know why it's doing this?