I've been thinking of doing one of these myself. Did you have to fortify it with sugar, or was the original SP high enough?
Do you think it would have worked out better if you had doubled up on the orange juice?
I followed the original recipe for sweetening it.
I'm finding when using orange juice to ferment it's usally a neutral type of spirit.
I don't think increasing the amount of OJ will make any difference. I saw on Shark Tank where a company was using OJ wine for the base of flavored wines. They said its de the perfect base because it was so neutral.
I would concentrate on the lemon, lime, and grapefruit favors.
Mark