Truth is I don't see what rpm I am on when upshifting/downshifting.
To shift up smoothly, is the combination in sequence of throttle, clutch control and engaging the correct gear for that riding speed.
For downshifting, with the three above, braking comes in.
Finding the engine rpm G-spot to shift is what we want when shifting gears. Too early a shift, and you won't have power to acceleration. Too late and there be jerks.
Observed myself that:
1. If the bike jerks while you're letting out the clutch, you are letting go
the clutch foo fast.
2. If you're lurching ahead during shifts, you twisting too much throttle.
3. Have to continue twisting the throttle till your reach the next gear
shift. Each gear is happy at a certain speed.
4. When downshifting, slowed down enough (braking) to shift into a
lower gear with the smooth use of the throttle, clutch and gear.
I am no expert but I strive to make my shifts up/down as smooth as possible (not to upset the chassis). Only way is practice and practice
(good excuse to ride) till it become an instinct.
I do remember reading useful advice in "Twist of the Wrist II" by Keith Code.