As I mentioned i picked up my new Mercury 9.9 short shaft elec start, it will be going on a 14ft v hull smokercraft Big fisherman model, i have a few questions that maybe some can chime in on,

(1) should i purchase some kind of a doel fin to help get the boat on plane now, or wait till i see if it will need one. are these beneficial other than get the boat on plane quicker any pros and cons on them, which is the preferred brand.

(2) service man at Bass Pro shops suggested i add some kind of an additive to the fuel, he did not mention brand.
any suggestions it it's a good idea.

thanks
chet

ps, I had a 25hp Yamaha on this boat, i had to practically get the motor almost wide open to get it on plane then i could back off a little to keep it on plane