I’m running similar to TwentyOneThirtyFive on one of my bikes, just with Stans sealant and it works very well at stopping the thorns punctures (I don’t bother taking them out either). The other bike doesn’t go near thorny trails…
I’ve tried strips inside the tyres, and they kinda worked, but not that well. My dad runs tyres with the strip built in (not sure what they are) and they work better than the strips you put in after. I’ve not tried slime tubes, so can’t help you there.
M