I hate when that happens
I have at least two tanks loaded with completely different taste bud flavors but at some point in time I can't taste the difference. Same non tasting sheeeeet.
Another thing that may help...
After a couple/few tanks, take apart the tank and give it a thorough cleaning. Scrape the crud off the coil or change it if its beyond scraping and change the wick.
I use hot soapy water, a thorough hot water rinse, flush with PGA and another water rinse.
I have found that this brings back the ability to taste the flavor