I like to make modifications to my guns that I can undo if I don’t like them, or if they adversely affect the way I shoot the gun.
You could try Talon grips or their grip material layered on the side shells and front & back straps. You would have to modify these for a Sig P365. I haven’t tried the Falcon grips that Glockstore sells but I know a guy that has Falcon grips on a Gen3 19, he likes them, and I like these better than the Talon grips that didn’t work for me on my Gen3 19. These came off & were replaced with a Pachmayr GripGlove, which isn’t the best looking Glock accessory, but which I like on this gun.