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The 4.0 firmware is Sailfish. The current version of Sailfish on the ToM is v4.1 which only has minor changes and certainly no changes that would impact print speeds or quality. Note also that if you are using SF-35 with Sailfish, then that may be part of your difficulties: Sailfish expects SF-50 and isn't supported for use with SF-35 at least to the extent that we've never tested Sailfish with SF-35, do not provide slicing profiles for use with SF-35, and if you are having issues with SF-35 the first thing to do is to stop using SF-35 and move to SF-50.