Sounds like it may be the result of wines made either with too little fruit, or too much sugar, or both, and ultimately ending up with light body, high alcohol, and out of balance.
No way to know unless you furnish some info., like starting SG / BRIX and finishing SG /BRIX of both. Size of each batch and what the recipe was, particularly the fruit / flavor part.
If that is the case, you could boost the flavor with more fruit and / or sweeten the wines to bring out the fruit flavors. Both of these actions will bring the balance closer to equilibrium. You could also make additional batches with lots of fruit, low alcohol, and blend them. Just a few options to consider.