shift speeds/rpm

ok - so just went for a 10 min. run and all shifted well. could still be just learning this thing..it is very different from any of the manual transmissions I've had over last 30+ years. Are you sure warming up the oils in motor and tranny could have no effect here?

maybe not..

Sure oil temp can have an effect, but it shouldn't stop it from going into gear but just feel more sluggish or tighter.
If the lever moves to the side and slightly toward the gear you want but won't go in the problem is in the trans.
If the lever won't move to the side to get over where you can move it into the gear without jiggling it around it's the linkage.

833's are a mans transmission and the light touch like a Honda, Nissan or Kia isn't even close to the same animal.
Don't mean any offense by that, but the only way I could think to describe it.

If it takes some grunt to get it in gear, but does it without crunching you are probably fine.
Of course there are other fluids to change how it reacts also. (like going from 30wt to ATF, or from 90wt to 30 wt.)