OP1w4k or other recommendations for my grip

My hands are 18cm x 9.75cm. I find myself very comfortable on my gpx; however, i notice that my thumb and index finger start to hurt because my hands start to tense due to how wide this mouse is and for its lack of curvature. I also found that the gpx restricts my finger mobility in this grip. After watching Viscose’s video regarding the op1 8k and learning that it allowed her to simultaneously stabilize the mouse with her palm and still have the ability to have finger mobility I made the op1 my top choice. I’m still a little worried it might be a bit too thin and I’m wondering if someone with a similar grip and hand size can vouch for this mouse before I actually buy it. If not, are there other mice that would fit my hand/grip better? Any advice is appreciated :3