I suggest using any 'classic' short pips in 1.8mm thickness (if you prefer to play close to table hitting and blocking off the bounce) or 2.0mm (if you have some tendency to go back one step behind doing some rallies)
By 'classic' means some short pips that has been used by most short pips backhand user known, such as :
1. Stiga Clippa 1.8mm/2.0mm (proven to be the most versatile for backhand usage. Enough spin, good speed, pretty stable in blocks, and some 'sink effect' due to opponent's misreading)
2. 802-40 (get the 35 degree hardness, or anything the softest one available. Definitely more spin than Clippa, less 'sink effect')
3. Butterfly Challenger Attack 1.9mm (good control, 'sink effect' is between Clippa and 802-40, but slower than Clippa on agressive/active strokes. Better control at blocking, some 'float' might occured while blocking)
4. Nittaku Moristo SP 1.8mm/2.0mm (feels like the softer version of Clippa, and some more improvement. Greater 'sink effect' yet still generate approx. the same level of spin)
5. TSP spectol 1.8mm/2.0mm (a bit more 'sink effect' compared to the first 4, less sensitive to spin. Of course, less spin. Mostly preferred for pure drive/flat hit style)
Some 'new generation' short pips which I've tried personally, if you prefer to use something 'funky', and of course needs some adjustments and intensive trainings to maximize the potential if coming from inverted :
6. Yinhe Uranus Poly 2.0mm (good spin to keep the ball safely into the table, good control in drive/flat hit. Not too fast for backhand, very stable in blocking and sometimes giving uncomfortable balls due to hard topsheet and medium sponge hardness. Almost as stable as most short pips like Clippa, Challenger Attack, etc.)
7. Spinlord Waran 1.8mm (pretty unique. Good spin generation, one can even do mid-distance looping instead of hitting, yet not too sensitive to spin, able to generate 'sink effect' in drive/flat hit. Blocks produce some 'float', need to do intensive adjustments in blocks. Good speed, and some clicking sound so-called 'speed glue effect')
8. Yinhe Uranus Pro soft 1.8mm (almost identical in playing characteristics compared to Spinlord Waran, with a little bit softer and more porous sponge, with cheaper price. The only downside is pretty much the same, need to do intensive adjustments in blocks, even more than Waran, due to the sponge characteristics. When you do, it rewards a big time; fast at agressive strokes, yet somehow 'float' a lot in blocking, especially when using 7 ply allwood blades. Currently settling with this one, the soft sponge really accommodate my playstyle, some backhand loops and drives/flat hits from mid-distance. Pushes can be deceptive, flicks, 3rd ball drive, and inverted-like opening loops close to table are pretty much comfortable, yet somehow feels troublesome for most opponents. Some national-level players in here are pretty interested in Uranus Pro. One of our Paralympic coach, surprisingly, is currently using it. When you spin with it, it spins well. When you hit, it sinks pretty good with not too much effort)