I must admit having to keep dripping juice and dealing with the mess and constant hassle of it was what put me off drippers for a long time util I thought about squonking. Literally the following day
@Genghis Fogs posted his kind Hotcig giveaway and the rest is history as they say.
I've since added two Topside Dual and two Pulse v3 squonkers as well as a couple of Steam Crave Pumpers which can turn virtually any mod with enough power into a squonk mod. In the DR Solo every time I squonk it soaks the coil and cotton which refreshes the whole build and then sucks back the excess juice into the squonk bottle so the flavour is always fresh and tastes truly awesome.
Must admit the Helheim is one I haven't heard of before so I just looked it up. I've never actually tried an RDTA.
As it is a 25mm atty you might find it a bit too airy using it with a single coil although if you just use the bottom airflow or maybe also 1 or 2 slots on the top it should work with a 4mm coil.