Could add some "Nature's Flavors" brand apple extract I conversed with a pro beer brewer who added their blueberry extract just before bottling to maximize flavor retention. The flavor does dissipate with aging.
Another possible option: Take a really strong flavored sweet fruity mist kit and make as per instructions then blend it with another non-mist kit 50/50 to reduce the sweetness level. Have made huge hits with a 50/50 blend Cranberry Chianti+red kit(labled it Candied Cranberry Chianti) and 50/50 blend Blackberry Merlot+red kit. Note both of these mist kits fruit flavor pack is very strongly flavored.
In the RJ Spagnols Blueberry Shiraz mist kit thread
http://forum.finevinewines.com/forum_posts.asp?TID=7799&KW=50/50
Have made a number of the Blackberry Merlot's kits and they have a
stronger Blackberry flavor than the Blueberry Shiraz which has a very
mild blueberry flavor. Most people prefer the Blackberry Merlot. The
stock Blackberry Merlot is good most non-wine drinkers love the stuff
ice cold. It is a bit too sweet for my taste and I usually dilute with
club soda or ice water in hot weather.
Agree the general
population's preference for cocktail type fruity sweet wines. During a
tasting party a descent mid level dry Merlot was not as well liked as
the stock sweet Blackberry Merlot. The girls did some blending and a
50/50 ratio quickly developed so we ended up uncorking the bottles to
blend and re-corked. The resulting blended wine has been in a big hit
with the general population although some would still prefer the 100%
sweet Blackberry Merlot. A way to cut the sweetness and make a fruitier
red wine essentially. One on my friends commented at another party
after trying a number of not so good homemade wines which ended up down
the sink, she brought out two bottles of this blend and it was a huge
hit with people commenting on the fruitiness.
Have tried the
adding sugar to make it stronger and ended up with too much alcohol for
the body it tasted more like a port. Now only make as instructed
without additional sugar.