SHOULD I STOP GIVING DASHCATS

I think it's actually good to be pushed out of your comfort zone occasionally. Not every mock is going to go smoothly, and it's better to face these situations now than on CAT day. From my experience, DashCATs have good quality questions, and I've actually been scoring slightly better in them compared to CDC Pros. So I wouldn't necessarily say DashCATs are harder. Can't comment on SimCATs though.

I feel your score drops could be due to strategy, question selection or maybe just how you handle unfamiliar passages. But don't let a few bad mocks affect your confidence too much, especially when you've already shown that you can consistently score well in other mocks. Try to figure out what exactly is going wrong rather than focusing too much on the scores. You don't have to give every DashCAT, but I'd suggest attempting them occasionally. It's much better to face these challenges now and learn from them than encounter them for the first time on exam day. Personally, I give a mix of CDC Pro, CDC Flexi and DashCATs, with around 80% of my mocks being CDCs.