Being experimenting with short, medium, long pips, and even going back to inverted on the backhand side (well, the forehand never change though, hard tacky chinese rubbers. Except when using short/medium pips, expect some FH pips whacking to give some surprise), somehow it feels beneficial. Using pips means less margin of error, resulting in forcing one to do any strokes as optimal as possible.
When I came back using inverted, it takes 1-2 hours of practice, and that's it. As long as keeping the footwork active, remembering the basic rules of pips ('on time' you may whack as you like, but when it's 'late', the more it is, the more you brush/lift, resulting less quality/pressure) and 'translate' it properly ('on time' you may spin the ball with adequate impact, but when it's 'late', the more it is, the more you brush the ball), it seems fine. Somehow it feels easier to do solid contact with balls. Though, it does takes more time to end rallies, unlike using pips; whether outblast them with some whacking, or outplaying using off-tempo blocks/placements.
Even after 5-6 years away from the table, and recent urge to whack some balls and trying to get back in shape, until now, it feels no issue to pick which material for my backhand side (for my level, of course. Consider me as an amateur with huge curiosity in the past which has been slightly cured, except for the EJ virus of course
). But from personal evaluation and suggestions from coaches which a bit surprised due to the fact that I've tried almost all playstyle (except being a long pips pushblocker. A big no no, I feel vulnerable being a pushblocker somehow, since I somehow enjoy playing against one), I somehow performs better with short pips (incorporating twiddling of course. Against partners who loves to play away from the table, once they go away, simply go with some short pips FH whacking. Against those who stays close to table, I prefer take a step or two, and try to 'break the wall' using FH topspins and BH whacking)
Long story short, perhaps it won't hurt to try going back to inverted for a while. Though, in my personal view, the pips are always addictive
If I may ask, what medium pips are you currently using?