I'm still trying to get used to mine (also very strong, -10ish and oblique astigmatism, which apparently makes it harder). It's OK now on the third pair, but I don't really ever find it comfortable and close or medium distances. I can see, ish, but just find it a bit stressful. I'm hoping it improves - I've had them about a month. One eye never seems to focus as well as the other, regardless of the prescription or distance, and I don't know why.
But I did have to go for the most expensive lenses, cost a fortune, and that was with my old frames, too. My frames are fairly small - they said that was better with the strong prescription, though, at least with oblique astigmatism. Larger lenses might give more space for different parts of the prescription, but can be pretty thick at the edges, even at the highest thinning level. (Mine are about 7mm at the corners, at 1.74 thinning, with pretty small frames, so I'd worry about how thick they'd be with bigger ones!).
Nonetheless, I'm still keeping them, as there are too many activities that I do where I need to change focus quickly from close to distance and back, so it's really impractical not to have them, despite the frustrations.
I do feel that more prescription tweaks could potentially help, but at this price I can't afford to try again, and I already sent this pair back a few times and think the opticians will hate me as it's not really their fault I find it hard or can't focus, as the prescription has been checked and double checked. I just have to learn to compromise I think.