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@optimuspig
I’ve just using the formula of 1xBP + 1xAC + 1xSR. Seems counter-intuitive to use SR, but long run you have a net gain in SR albeit at a cost in BP, AC and gems.
Another good formula is 1xDG + 2xBP, which earns SR more slowly, but actually results in a (very slight) long-run gain in BP as well.