[shilala]

Sounds to me like you're running in first too long before getting to second, then slapping second before the rpm's back down enough.
A lot of guys have said "listen to the car".
My brother once taught a deaf kid how to drive the dump truck simply by feeling the motor through the stick. He could drive that old dump flawlessly.
Ya just gotta feel the machine and let it tell you what to do, just like any machine.