Reading your posts through again and experimenting with the Arturia program, I think I may have found out why you're having problems.
I suspect you may be trying to move the knobs by moving the cursor left to right instead of from down to up. That's perfectly logical and if you can't see the knob move you probably wouldn't realise what the problem is.
If you place the mouse cursor to the left and slightly below, or put it on the knob at the bottom and follow the dial round, it'll turn clockwise - left to right. If you think of it as moving from below upwards it'll probably respond as you need it to.
That's with linear mode, which loaded as the default on my synth. I tried the two other modes to see if they're much different, in case one might be more suitable for you, but they're all pretty similar and respond in much the same way.
I mentioned the Creamware system because I know it's being used by a blind synth player, Jean-Philippe Rykiel. It's a software package with a hardware controller. I wasn't especially recommending it, and as you've already got the Arturia software it makes more sense to work with that. I mentioned it because although the hardware controller is designed specially for that piece of software it was still helpful for Jean-Phillippe to have a sighted person help with the setting up when he first got it. I thought if that was the case then you'd possibly find it helpful for someone sighted to help set up any hardware controller you might want to use with the Arturia. It must be very difficult when so many items of music technology assume sight. Blind musicians don't really seem to be considered enough when these things are being designed.
It may be that you'll find the Arturia much more responsive by trying the mouse the way I've suggested. That may just resolve the problem. I hope so. But many people find a hardware controller useful, and I imagine if I was blind I'd find it much easier to use something I could touch and feel the status of the control knobs with.
I believe Beringher make reasonably cheap and useful MIDI controllers that provide a good number of control knobs for softsynths. I've recently started using the Korg Legacy MS20 controller. but only because I bought it for other reasons and then found out it'll also double as a hardware controller.
Anyway, try a different approach with the mouse and see if that helps. Post again if you need any further suggestions or information.
Regarding the lack of response from Arturia, I don't know how things are in the company, but I've noticed they're very helpful when they do respond, but the seem to have times when they're too busy. That makes me suspect they have only a few staff who are doing everything as best they can and they sometimes have to leave one job to do other things. This forum used to close down because there was only one person running it and sometimes there were technical problems and he wasn't available. It looks to me like Arturia is a small company who happen to have made several brilliant products that need to be supported for a large number of customers. Looking at the questions on this site about adapting the software for various different operating systems and so on, I can see why they might be slow at replying.