DIY Vape Juice still don't taste right - Update

Hey guys, quick update.

So after a lot of people advised that 20 - 25% was way too much flavouring to use in a DIY vape juice I cooked up a new one with 8% peanut butter flavouring. But it tastes pretty much how it did before. I looked into 'vaper's tongue' and bought some mint listerine. This stuff basically burns my mouth to use it. I rinsed out a couple times, left it an hour, cleaned out the tank and tried the new juice. But it still tastes pretty much how it did before. So what's the deal? Did using too much flavouring in the first PB vape juice I cooked up somehow nullify my tastebuds towards it so that now I can't taste it? I changed the OCC head thinking that might be the problem but it isn't. Any suggestions? Thanks for all the feedback and the help, it's pretty annoying!