The rule of thumb I learned for Caribbean punch was 1 sour, 2 sweet, 3 strong, 4 weak and It seems to work with pretty much everything. Eg:
1 lime juice: 2 simple syrup: 3 rum: 4 pineapple juice or
1 lemon juice: 2 honey: 3 whiskey: 4 apple cider
Etc, etc,,,