I posted this a couple weeks ago on another thread. I finally gave up. But increasing the suction might work.
"I used the MX8 for almost 10 years. I went through two of them. I replaced the scrubbers with the ones from the elite I bought on ebay. When it worked it was great. My issues with it were it would get stuck in a couple of spots in my pool. I had to buy something new for it every year such as turn gears, rubber wheel bans, new hose, etc. Again when it worked it was great. But a slight change in pressure would cause the hangups. I have a dedicated wall fitting for it. By the way speaking of the hose, I used regular cheap hose. You can find a replacement fitting for a vacuum hose, cut off one of the ends of the lock hose and now you can use any hose you like.
I ended up replacing it last month with a M400. It was a pain to remove and replace the MX8 and with the robot I only use it about once a week.
If I decide to go back to a suction cleaner i would get the MX8 again."