Just keep an eye on things. When I started out (DL) too high nic, my main symptom was coughing. I know diluting down can be a pain and start to have flavor issues, but if it were me and I was coughing while vaping, that would tell me my nic is too high. It's possible adding a bit of VG (since you are looking for more clouds) could greatly improve your vaping experience without impacting flavor too much. Depending on what resistance your coil is, you may not need to dilute it down very much, and it's certainly true that vaping more clouds can start more coughing at the start, if it persists, I might either save that juice for you MTL setup, or get another juice for your sub0hm setup.
Best of luck and if you continue to cough, I'd say be on the lookout for nic overload (although, if you can't vape it successfully and long enough to get nic sick DUE to the coughing, well, that might be another sign that you may need to lower the nic.
Anna