Welcome!
Practice. Then practice some more?
Driving observations:
Upshifts :
1 -> 2 notchy. not really a problem because who needs 1st gear anyway? Sorry, you probably would. Um, practice.
2 -> 3 lots of people have trouble trying to shift quickly here. requires a bit of touch for consistency. If you abuse the box with this shift, I suspect you will end up with a box that never shifts quickly to third. Mine's brilliant now @ 63,000K
3 -> 4 Nothing to note.
4 -> 5 Not as quick as 2->3 for me
5 -> 6 Nothing to note.
Downshifts :
2 -> 1 Moving much? Don't bother. If you must do it on the move, very notchy. Why are you shifting to 1st on the move?
3 -> 2 Good squirt of accelerator to rev match for 2nd gear. Moderate shift speed
4 -> 3 Gentle squirt of accelerator to rev match. Smooth quick shift.
5 -> 4 reasonably quick
6 -> 5 moderate shift speed
Clutch - heel pivot is the go for me. i.e. I bring my heel down so that as I release the clutch my heel drops against the floor mat at the friction point then pivots . Others?
Heel-toe - very difficult for me trying to do this using ball of foot for brake and heel the accellerator. I can't so I use the ball and inside of the right foot for the brake and pivot and slide as needed to toe the accel.
Other notes : Gearbox is smoother to shift and quieter with Penrite SIN75W90 in it, and mazda will cover that as warranty if your diff/box goes WOONGWOONG cold at heavy steering angles