The ECU will interpolate between the bins.
Such as if your highest bin is at say 5500 rpm, you can still run the engine up to 7000, the ecu will use the last bin it was at. Also different code versions do there lookups in different ways so this varies some.
When I am mapping I work a session and then go back when allot has been done and smooth the curves. Then tune again and check to make sure the engine was not asking for something we consider weird.

On of what takes awhile to grasp is that we can not tell the engine to do what we want. We just need to respond to and give what it asks for. My previous paragraph of going in and smoothing the numbers contradicts this and that is whey we tune again to check if it is right to have changed them.

B&G code uses very odd ways for filtering the O2 input. You can work with the settings and get it to respond better. It may also be set to work at higher revs for when you start tuning the driveability.
Are you going to be able to get on a dyno or are you road tuning?

If road tuning, readup and get the auto tune working.