I know I have to put some seat time in to learn how to really get the most out of my XB21 Bassport. My question is sort of a hard one to answer as about all of you don't know what my skill levels are to start with etc. But, just for conversation if nothing else, if I'm an above average driver who has run Rangers, Tritons, etc. in the 70's for many years, how long do you realistically think it will take me to get to where I can really start to fly my boat? JFYI, first time out by myself I ran it 77 in some semi-rough water on the river with no issues. This thing has so much power it would be a crying shame to never let her loose some while I'm having a little fun. I just want to live to tell about it!
What helped me was the engine break-in process. You're forced to drive for an hour at 3k rpm, then another hour at 4k or less, then another hour at x rpm varying speeds. The break-in instructions on the merc tell you to trim down to make the engine work hard. If you've ever been in an allison XB21 trimmed down at 4k rpm, that's about 65mph. For a regular fishing boat, that's not a big deal. On an Allison, you've got all the keel in the water and you learn to "drive" it and to balance it.
That helped me out a lot by being forced to drive it under limitations. Now, I can't drive the Stratos I used to have because they're so loose in the tail and require so much driver input.
Seat time is the key. Respect the boat, don't "force it" to run, it will come to you. You are balancing the boat, not fighting chine walk. You will need to "unlearn" driving Tritons, Rangers, etc. in order to "drive" an Allison. Don't over trim. The rooster tail should always be below the cowling height. These boats run flat.
Good luck and have fun.