Currently I'm specifying intensity 24.
Before employing TBM I was getting stales of around 0.5-0.8%. Now I'm seeing around 1.25-1.5% so this is within the range you specified and not anything unusual.
I mine on crazypool because they tend to be one of the more profitable pools to mine at and I prefer to mine on smaller pools. They also have a lottery system which affords the chance to win 0.1 ETH.
The git page seems to have some odd information here:
https://github.com/sp-hash/TeamBlackMiner/blob/main/FAQ.mdConflating uncle blocks and stale shares. Even if that were true, crazypool does find and pay out uncles.
I checked a few of the pools on the page (MPH, f2pool, 2miners) for their stales policy. MPH and 2miners don't say anything about it one way or another. F2pool indicates they don't pay stale shares.
The client seems to be running per expectation on my end and I'm going to continue with it for a couple more days to get a conclusive result to compare with.
So there are different levels of 'stale' that the pools deal with, and TBM reports true stales in the rejected frame - you'll see an error report back from the pool as a stale share in the TBM output, so the numbers that the TBM client is reporting are an estimate of a 'level 1' stale share and is not anything I pay attention to if I'm mining on 2Miners (which I do).
What cards are you running? An intensity of 24 on an AMD Big-Navi RX68/900 series shouldn't be generating any stale shares -- even in the client window. I run a rig with 6800/6800XT/6900XT in HiveOS and am averaging about 63 MH/s at the pool (but TBM is a spiky miner, so the rates over 6 hours can change from a 6 hour average of 70+ to 59 MH/s). With the profits of ETH declining so much in the past couple of months I am loathe to give away mining secrets, but it's most likely the ASICs that are killing my profits, so here's my 6800XT details for HiveOS against 2Miners (you can test them and see if you are getting better stats on crazypool):
Version 1.56; xIntensity = 190
And those share rates on 2miners averages out to 61.5 MH/s. - Windows will give the same client reported hashrate, but mine +2MH/s at the pool