If you have a vapito cosmic kit, more than likely it is a knockoff/clone.
I have a cosmos tank, if the head is thoroughly primed it works fairly well at least on a truly adjustable output power device.
Priming the head took more drops and they were slower to absorb than a nautilus head. Starting off at a lower power setting like around 8.8w ~ 9.2w for the first couple dozen vapes then slowly increasing power over the first tank to allow head to 'break in' & to ensure wicking they never me gave a funky taste.
I also use 50/50, for me the 1.6Ω head worked best from 9.6w - 11.8w. The .7Ω 10.2w - 17ishw.
If you have the airflow near to or wide open ( 'dtl settings') especially when using the 1.6Ω head it just won't wick well, I suspect due to not enough negative pressure build up in the tank to aide in wicking ability.
Actually mine won't wick either head properly using the 'dtl' / high airflow settings.
Restrict the airflow down to something similar to a nautilus full airflow to slightly more open - no problems.
Like stols001 mentioned, I found the priming/break in process frustrating, took me over an hour of dripping drops & waiting for them to absorb to ensure the wicking was fully saturated. I ruined the first 2 heads trying to rush priming & turning up the power too soon.
Side by side with a nautilus, I think the cosmos is 'better', but it does have a few shortcomings. At least with mine the heads are difficult to properly prime, as the head ages it starts to flood especially when refilling. I had one head allow liquid to flow out the airflow almost as fast as you could squirt it in, still vaped great no off tastes.