It's very hard to give advise.
If you read the amp anealing site you will see colour or time means bugger all as different brass gives different results. The only sure way would be if someone is doing the exact same brass with the same thickness and brand, and has had it tested. But even still you won't get the same heat source.
If I'm having a stab in the dark, usually too much is soft and the brass can fold up when sized. No annealing you get split necks.
Actually you could be ruining them. I can get 6 fires from Hornady 7 REM mag with no splits or bad accuracy, without annealing.
I was in this boat.... 6 firings then buy more brass vs amp. I went amp but only because I had to neck down and figured the extra stress might be worth it, also I wanted very consistent accuracey from this particular case. Even still it's hard to justify. If I just had regular cases I wouldn't own a amp, I'd buy brass.
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