From personal experience EJing around short pips with yinhe blades (v14 pro/pro 01), perhaps :
1. Spinlord degu. Soft sponge, good spin generation, yet not too sensitive towards incoming spin.
2. Spinlord waran. A bit harder than degu (still soft though. More solid feeling during active strokes), still good spin generation (tad lower than degu), but significantly faster than degu
3. Nittaku moristo SP. Prominent ESN/tensor feel, so-so spin generation. Typical classic japanese short pips on steroids, very speed-oriented. Anything goes boom once one starts hitting with it. Be ready to send knuckleballs with this one. Feels harder than waran by a slight margin
4. Nittaku moristo SP AX. Contrary to its predecessor, SP AX feels like 802-40/spinpips on steroids (yes, it's ESN-made), very spin-oriented. Feels hardest, but not in an uncomfortable way, perhaps can be said, solid.
Regarding thickness, it depends :
Thicker sponge (2.0mm - max) makes easier transition from inverted, thus more stable in strokes. More spin and speed can be generated. For optimum result, one may optimize the playstyle through outpowering opponent i.e. punch blocks, drives, smashes, flat hits), or spin variations i.e. 'fake' loop/topspin, sometimes spinny, sometimes not so spinny; or sometimes simply drive the ball when the ball bounces higher than the net. The only downside, minimum passive deception/disruption.
Thinner sponge (1.8mm - any thinnest options available) requires drastic adjustment (blade angle, type of strokes regarding types of incoming balls, etc). Less spin generation, resulting in what people call deception, disruption, funkballs, dead ball, etc. Speed depends on blade's capability, which may affect control, since the ball is easier to 'hit' the blade, rather than 'cushioned' on the sponge, resulting flatter trajectory the thinner the sponge is, or simply said, lower margin of error if compared with thicker sponge (this I must emphasize, since you're using pretty fast blade such as v14 pro)
Rule of thumb for short pips backhand :
1. Choosing hardness, make sure to choose the 'right' hardness. Not easily compressed when blocking heavy/fast topspin balls, but one can easily compress it when doing hits/drives
2. Choosing thickness, the more active one's stroke is, thicker sponge is preferable, and vice versa
P.S. : mileage may varies. Every pips user have their personal preference, especially blade-pips combination. And also, if one is looking for lighweight pips, do consider degu and waran.