i’ve tried the Evah slap plain G. It’s not a bad string, particularly at the price point, but I feel like the gamut Lyon is far superior. It’s less thuddy and has a “snappier” response on my bass.
FYI if you wanted to try again it that’s the same gauge as the Evah plain gut go medium+. I personally opted for heavy last time I tried this though and thought it was a great match!
6 - 9 mm felt a little too low on my bass for the slaps, either all synthetic or with gut. It isn’t so much that they didn’t work at all low but they lost some weight behind the note and had a tendency to bottom out at time with my touch/technique. That being said they were very comfortable at a slightly higher action than that, and had a big sound. I also think that the slaps would match plain gut better than the perpetuals, which remind me more of Spiros than anything else.