I donít have an answer to your question but I can say that the Fujifilm brand grip I bought for my X-Pro2 was the worst grip I have ever used. Itís big, heavy and the shape is uncomfortable to hold. I used it once and that was enough. Something much smaller like the Voigtlšnder Bessa grip would be perfect for me. When it comes to grips smaller can be better.
All the best,
My poems are mere words written in the sand with a piece of driftwood and a carefree hand.