mid range is hard to officially test, its more about feel and the response you get from the bike. it takes some skill to interpret how the bike rides and pick up on the jetting.
With that said, i see no harm in your idea, something to keep in mid however is that the size of the main jet influences the mid range as well, there is overlap and is produced mainly as such: if I have needle st at mid clip with a 230 main, then I stick in a 330 main, obviously my top end will be richer but this also makes the mid range richer. why? because the space between the needle and the main jet that allows fuel passed is bigger at all stages of throttle opening, hence richening up on the main does boost the mid range as well, in cases with modding, you may need to adjust the needle to give the mid range another (richer) platform to work from.
Best way is to pull off and get into about 4th then steadily ease in the throttle , not punching it but gentle, the bike will run through the revs and you should be able to feel the transistion between needle and main, pilot and needle, if you feel a hickup, a burble or a bog, you need to pay attention to the needle.
The needle should always be set last, after your main if plug chopped and your pilot is set at idle
