I had the same problem with my cartos in a Riva 510 but I figured out that was the way I was filling it.
The first refill is really important and the Boge 510 2.7ohm (regular voltage and size) do take up to 30 drops (brand new only). Its important to fill it with 15 drops, let it sit for 10 minutes and then put another 10 drops, wait 5-10 minutes and then put another 5-10 drops. It works fine with 20 drops but you will might to have another refill really soon on that carto.
The way that I figured out that works better for me is to filling it dropping (like drip tip in a atty) using the small condo (that has the "little ball in inside" and after the first 15 drops, take that and give it a shake. You will see the juice at the bottom but that should not flood the carto at all, its just normal.
Now my cartos are fine and once I start to not taste anything I drop at least other 10 drops to use it right away, or then 20 drops and let it sit for about 20 minutes in the vertical position and with the cap/condom in both sides. Remove the condoms and clean the carto with a papel towel and you good to go.
I hope it works for you.
Happy vaping.