You're all probably right. The first hits ought to be stronger after the throat's night's rest, but I haven't experienced it. I'm actually not a fan of TH, just want the flavor and nic, so I vape 6 mg nic and more VG in the juice. The difference I've felt is by late night, my taste buds are worn down and the flavor diminishes, taste a little more in the morning.
There are 2 current threads on this subject in the General Forum - "Everything tastes like crap" and "Everything tastes like vinegar", may be relevant.