Ohh yeah
I have tried all sorts of spring/shoe combos on the 7 Port and have found that it needs the heavier springs. With the extra ports the motor needs to spool up a little more then the other GO's before the clutch hits, or it can be a little boggy off the mark and out of the corners, regardless of tune. You can get away with 1.0's, but the 1.1's are nice on any track surface with this motor. Either 3 x alloy shoes or 2 x alloy with a carbon to soften it a little and prolong shoe life.
I use the X-Ray 1.71 shoes and they last extremely well.
He he - "shotgun blast out of the hole" sums it up nicely Jasonguy