I've had varifocals for over 10 years - I'm short sighted (-6 ish) with a bit of astigmatism.
I have found that they have to be set up correctly, otherwise I get a tight feeling across the forehead and/or I cannot see properly. As said before, the centre of the lenses must be in front of your pupils - not just a question of altering the frame's nosepads, but also check if the dispenser or glazier has not noted if you are a 'Prophet' (one eye's 'igher than the other..) and has made them with level centres. The tilt angle of the lenses away from the face I have also found to have a significant affect.
After many years with Zeiss lenses, I changed to Varilux - they claimed that 80% of users found their new ones to be an improvement. Unfortunately, it turned out that I was one of the 20% who didn't - 1 year later, I insisted on changing back to Zeiss and the relief when I put them on was immediate, so you may consider changing lens manufacturer.
My reading adjustment has gradually increased so now I notice that there is a small 'sweet spot' for reading, particularly in poor light - when I next change, I will be looking for a deeper pair of frames, which I suspect will help.
Regarding distortion, many years ago (before the need for varifocals), I stumped up the extra for thinner lenses; the new ones were flat fronted, with most of the curvature on the back surface. These had much less side distortion; I could see images in the rear view mirror clearly without having to move my head. As with most things, everything being equal, the more you pay the better the quality. However, there are some very expensive opticians out there...
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