I have found that as soon as you get any slop on the countershaft it will start wearing even more rapidly.
I've run Iron Man sprockets for quite a while and have had no issues. I believe what you're experiencing is probably normal wear. I've been sending batches of sprockets to this guy for treatment. If I were to replace a countershaft I would probably give it a try. I believe there's no question sprockets last longer doing this.
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04 Montesa 315R, 07 EC300, 21 KTM Erzberg 300, 21 Sherco 300 SEF-F, 23 KTM 690, 23 Rieju Mr Pro 300
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