I ran a series of small squares, and sets of lettering to test. Each done 20 ipm, 40 ipm, 60 ipm 80 ipm and 100 ipm. This is what I use to test a cut in new material; felt, thin board, cardboard, etc. I do the same for the engrave text. Each time I use a file, I duplicate it and I either remove the ones I think will not be in range, or dupe a range to get finer gradiations. You don't want to test cardboard at 20 ips. You can lengthen the burn times by using the 'Speed Scale Adjustment' (Y+/- buttons) to decrease the ips. 100 ips is a pretty light burn. You can't increase it beyond the factor of '1'. If you decrease to 50% (0.5), then you change 100 ips to 50 ips (or pretty close).
I save these test files, and pretty soon you have a good set of test runs. You CANNOT control the intensity of the laser, only the duration using different speeds. There is a connection on the laser for an intensity, but no way to control it from the Axiom.
I cut felt liners, game pieces, tiny wood pieces, and some logos. I do engrave my signature in the backs of some of my pieces.