Sadly I'm now confirming same, it misses dits and dahs at as slow as 10WPM and regardless of in IAMBIC or IAMBIC B mode.
I field tested it today.. nevermind that the screen was near impossible to read, but CW was near impossible to send. I set the QSK to 650mS and it approached reasonable. Sometimes the memory keyer would work, other times it would abandon partway through the message 'cq pota de ve6lk k'
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AGC was off.
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