Hi Anton. Going to try answer your build question.
I am not an expert on the OL16. I have only tried a few builds. Havent experimented with various wire types or exotics. Only Kanthal for now because I know it.
My standard build I always start with is my typical 1.6mm ID 28g 7 wrapper. That didnt feel right on the OL16. I needed a bit more juice so went bigger on the ID and found it good at 2mm.
I prefer 28g (to for example 26g) because it gives me a crisper vape. You might like a more dense vape on 26g
I must admit i find it quite difficult building on this atty because I am not very nimble with dual coils and only two post fastening points. Probably why i havent experimented too much.
Anyhow, my coil position is nearish to the edge and quite high up. I found on the RM2 higher up gives me a bit more throat hit so my thinking is that will do that here too.
Am using CB2 wick - not too tight or loose, just snug. Wicks touch the floor but dont go snaking anywhere on the deck. This wick draws up the fluid very nicely.
You can see here on the photo below, the coil is in the upper half of the airhole.
With regard to airflow and power, in my opinion the OL16 suits a mildly powered restricted lung hit.
I use it with the biggest airflow setting but its still quite restricted.
My dual coil is 0.5 ohms, so about 30 Watts of power or 15Watts each coil.
Its a small atty so i think it excels at flavour and doesnt need much power to do this.
You could try push it harder and build to free up airflow to get a bit more out of it but my feeling is that its not needed.
For me its superb on longish restricted draws and medium power and i find it suits the single battery
Not sure if that answers your question but i hope it helps
Thank you for the detailed response @Silver it does help and have pointers i can consider.
I will be building this in the morning and give feed back with photos and in the afternoon how the flavor was during my daily vape.
I still have a load of work to do tonight so building will have to be resumed in the morning.
Feedback will be given to @Silver and @RenaldoRheeder on my vape.