Back-pressure and shifting

Can lack of back presure have an affect on how a bike shifts? My 750 has some funny ticks with the shifting like not wanting to fully shift into first unless I really pound it down, or not clicking all the way through a gear going up. I noticed when I added baffles before it didnt seem near as bad. Just a shot in the dark.

Anythings possible man! lol

You may need to adjust you're shifting routine to include not snapping the throttle closed as much during a shift - this is when backpressure/vacuum spikes its highest.
Maybe avoid clutchless shifts or slow your shift slightly.
Always make sure to firmly engage every gear with the shift pedal, as not doing/miss shifting increases wear.
And use a good motorcycle wet clutch approved oil of the correct weight.

Cheers!

No, baffling will not effect how the tranny shifts. When was your last oil change? I notice as the oil gets really dirty it tends to make the tranny shift harder.

Thanks for the advice guys. I actually planned on doing an oil change tomorrow. Hope it helps