I also just got a riva 510-t that I have been fighting with since Monday. I first made the mistake of filling the tanks that came with it not in the package and the crap went everywhere. I soon realized there was supposed to be a little rubber cap. I used a new one filled it and I also had the nasty burnt taste every hit unless I put a few drops directly on the wick.
I am not sure if yours is doing the same thing as mine but my tank was not getting punctured like its supposed to. I took the little rubber cap off and poked a small hole in it with a kitchen knife. Now it is working like a dream and no more nasty taste. Its worth a try. I also ordered some cartomizers and a clearomizer today to see if that would work better with what we have. Good luck. I know your frustration, I felt the same way and almost bought a pack of analogs. Just hang in there you will figure it out.
I am not sure if yours is doing the same thing as mine but my tank was not getting punctured like its supposed to. I took the little rubber cap off and poked a small hole in it with a kitchen knife. Now it is working like a dream and no more nasty taste. Its worth a try. I also ordered some cartomizers and a clearomizer today to see if that would work better with what we have. Good luck. I know your frustration, I felt the same way and almost bought a pack of analogs. Just hang in there you will figure it out.