Shifting too much can kill your times. Most courses you stay in 2nd. Remember shifting wastes time. Each upshift and downshift is .5-1 second added to your times. Unless the course has really sharp u-turns on uphills it's not necessary to shift.

Good job though. PAX times is like a handicap for golf. That way you can compare a Ferrari 360 Modena against your Civic. PAX would be like driver vs driver instead of car vs car.