I have same issue ....
I didn't get response either .lol
I'm not sure that everyone has same issue like ours.
I experienced so much issue using mlr_2.6_AUX with my set up.
It was very easy to crash when even though i followed steps from forum .
i've tried mlrv but using delay with tilt can freeze app and makes super loud white noise..
maybe my computer doesn't fit these apps.
(my specs are similar to yours.)
Then I switched to re:mix app and everything works fine.
You can't use 64 to control vol/effect and etc but this app works very smooth and no crash issue.
i use ipad to control these instead.
I hope you can find solution.