To improve QR, if a question looks soo long (like the table questions u mentioned) just guess it, flag it and move on, and look at these flagged questions at the end. It's better to answer many easy questions that u k how to do instead of staying stuck on a few hard questions, which wastes SO MUCH time.
Try not to use the calculator as much as you can, personally I learnt some mental maths tricks on Medentry which have been really useful, but idk if Medify has this as well - maybe Youtube?
PLS USE THE OFFICIAL UCAT RESOURCES A LOT - I'm resitting the UCAT this year because I used Medify last year and only used the official resources a tiny bit. On Medify my scores were around 2800-3000 but I got so used to the question style on Medify and by test day, I completely flopped the UCAT as I didn't get used to the official UCAT questions. The stress got to me and I got a really low score

I've never heard of passmedicine, but I'd say carry on using Medify, as well as official UCAT resources, even if it makes you depressed. Lots of people have said Medify is way more challenging than the actual UCAT, so you're doing finee
I think untimed practice is important to perfect your techniques, but don't do it for too long! I'd say do untimed practice for one week and then switch to timed practice when you've perfected your technique.
Hope this helps!