There is a possibility that your mixes are slightly over-flavored. If your mix is high VG the odds increase a bit. It might be a matter of a fraction of a % over. I say possibility because it is fairly rare that a TPA flavoring goes from great to reduced flavor in a fraction of a percent.
Can't say for certain. I wouldn't vape a tobacco that is referenced by a number come heck or high water and I've never had any desire to vape Horchata. I hate banana nut bread, the real thing, with a passion that could light a city and I use Pineapple as a spice, not a main course so that percentage seems high to me, but I'm not making it my main in anything so that has my bias showing.
We agree with Hoosier's "possibility", and would add that in our experience, it's likely more than "slightly" over-flavored...and as you've likely read, over-flavoring definitely can reduce the flavor intensity.
i used TPA the flavor was
pineapple-at 15% added 1% marshmallow -- the strongest we've ever used was 8%, and that would have been way too much/strong if it weren't for the massive percentage of other flavors we used with it.
horchata at 10% added 1% bavarian creme - there's a
thread entitled Hornuts in the Recipe subforum regarding Horchata and the general consensus was that over 7-8% was too intense (even with piling on 5-7x as much cream/other). We couldn't tame the Horchata beast until we took it down to 5%.
ry4 type1 at 15% added .5% AP While the recommendations for RY4D go into the double numbers, the ones for Type 1 are typically below 10%.
banana nut bread at 8% plus 1% Brown sugar extra this doesn't seem like too much to us
It's fairly typical to lose a bit of flavor intensity after a full steeping.
No one has mentioned "additives"...but EM/cotton candy, Sucralose/sweetener, lemon juice & vinegars will ALL lessen intensity. It happens after a few days/more with the last three.
I gave up on that one lol. donated it and some others to a friend. decided it wasnt worth the trouble 
