So back to the 1 -> 2 and 2 -> 1 change issues, this is also a function of the ratios and the engineering of the gearbox itself. All modern OEM gearboxes I've come across have 1st and 2nd sharing a shift fork. Same with 3rd and 4th, then 5th and 6th.
The info I had in this italicized space was all wrong because I didn't think through my logic and flipped a calculation super duper early which led to correct assumptions validated by incorrect data. Thanks to @Ultramaroon for reminding me torque multiplication is the output side, and rotational speed is the input side, hence why we get the wonderful money-shift. Per his later post:
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The lower the gear, the greater the mechanical disadvantage through which the syncro clutch must drive the input. The viscous drag of the gear oil is amplified in the lower gears, and the syncro clutches in this transmission are as compact as possible for a conventional gearbox. There's more to it. The layout of the gearbox with respect to what the 1-2 syncro clutches must drive also plays into the picture.
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We can't do anything except be nicer and give more time, or be forceful and send the teeth mashing together. Eventually things loosen up doing it the second way.
Additionally, on downshifts a rev-match while the transmission is decoupled gains some benefits from friction. The selectors are all spun up a bit by the output shaft speed as you give the input shaft some extra RPMs. It's not perfect, but in a 2 -> 1 shift it makes it a lot easier.
In my 86 it's easy to hear the faint whrrRRRRRR of gear teeth speeding up as rotation is matched when selecting 1st from any other gear with the clutch in. Not sure if that will last forever, but there was a similar thread a while back where someone else mentioned they had the noise and mine still does it 30,000 miles in.
All that said, you can't fight math and physics, especially friction in a cold gearbox (even room temp is a little cold for a transmission) vs an operating temp gearbox. The only real suggestion I have is to be a little more patient or drive it like a 5 speed using only 2nd through 6th. That way you skip the massive delta and associated notchiness that comes with selecting 1 -> 2 or anything -> 1.