The MSC was right, (slow in, accelerate out), but that doesn't mean HARD braking, followed by HARD acceleration... what I am talking about is to keep your speed pretty low between turns, so you don't have to do a lot of braking before the turn, and thus don't need to go WOT coming out of it... that will help you be smooooooth...
An example:
I used to do exactly what I described above, i.e. go fast between turns, brake a lot before each one, accelerate hard coming out of the turn, and all that while trying to keep my rpm in the butter zone... great... it was fun but took a lot of work, and I wasn't any faster than any other dude...
Then I took a look at Cali_Rider, who will follow the indicated speed limit (in the canyons) throughout the whole ride... so if it's a tight canyon and the speed limit is 45mph, he will click in 4th or 5th gear (maybe even 6th!) and stay at 50mph the whole way down the canyon road... no matter if a straight line or a tight turn, he will try to stay as close to 50mph as possible.
What this forces you to do is to be smooooth (again)... not a lot of hard braking, not a lot of hard acceleration, just a constant smooth progression. It is also less work on the controls, less changing gears, and more time to focus on your line, smoothness and form... and believe it or not, I feel better, and I am faster now than I ever was!