Well the best way to hold an incredible(gold sparkly sail indicator)
is to make a donkey+ then keep making consistant bingo's if you do lower than bingo's in your combo then you may drop, so i do not recommend anything lower than bingo's. using the blocks that are there will also help you more so with the combos than just making a normal 3 and breaking it to release the combo that has no blocks in it.
So all in all try to make your first combo the as big as you can do it with as many blocks as you can use in it then after that you can just start making bingos =]
and while you are making your combo's try to make them so they clear the board as well
have fun sailing guys
hope this helped alot.