Mark hit the nail on the head. Your first month of so of
vaping is tricky because your taste buds might go awol on you, so whatever you do, don't throw away those liquids you don't care for right now! A week from now they might be the best thing you've ever tasted.
You know that you like RY4's, so if you really feel like it's your palate instead of the dreaded tastebud fail (generally happens around three weeks into
vaping exclusively, from what I've seen) you might try some recommended RY4's as above, or one I like, COV CY4.
I 2nd the rec to find a menthol that agrees with you - the only thing that got me through the blah's was a menthol that is no longer available, but I'm sure you'll get some good recs.
Hang in there, it gets better, and you might find that your palate isn't the least bit interested in
tobacco in a few weeks. My "aha!" moment was pina colada - it just
felt right. That's when I realized I wasn't trying to replace cigarettes any longer, just enjoying the alternatives that are available.