If you keep using the nautilus coils, I’d recommend lower temps, shorter draws, and not chain vaping many hits in a row. For me, the nautilus coils were finnicky. Seemed to either get burnt taste or gurgle too soon. My tank glass broke and I went to a device with GTI coils and they seemed way less quick to get burnt or gurgle. Flavor was better too.
I’d suggest a pod device if you wanna stay with that strength. Pod juices like you are using have different percentages of vg/pg than the lower nic stuff.
Geekvape aegis hero q, uses QPods and have excellent flavor, pods are true top fill but have had some leak out the bottom if they set idle too long.
New Voopoo Argus g3 pod is also an excellent pod device, not sure how long the pods last as I’m still on my first one 2300 hits in.
Shocked the 20mg in that device you have isnt crazy strong. So I suggest lowering temps see if that helps, but that juice you have is really for a pod device.
I’m no expert, just giving tips on what I’ve come across. I didn’t think I’d like pod devices, but I like strong juice 55mg, havent gone back to my vaporesso armour max since I got the pods. I was using 6mg in the gti coils and wasn’t strong enough for me. I liked 12mg in it but my local stores don’t carry much freebase higher than 6mg. I put 55mg in the gti coils .8ohm and it made me sick in 3-5 draws. Way too potent. Gotta use the recommended juice with the recommended devices. Good luck to ya