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There may be some issues with your 915 but you are not wrong that it is very old technology and even when "perfect" it isn't a Miata or a BMW 3 series or any "good" shifting trans.
VW bugs and 901s use the same syncro technology and basic architecture but they shift better because the gears are smaller and lighter, use smaller clutch disks and the syncros don't have to work as hard. Close ratio 915s shift much better as well as using a non sprung "puck" clutch disk as this decreased the inertia that the input shaft has. Not something you really want in a pure street car though. I found with my 915 with stock gearing I could downshift faster that then syncro if I double clutched the downshifts but that takes a lot of time to master and is really only for on the limit driving you can't or at least shouldn't do on the street. Learning to work the gearbox is part of the 911 experience........ or you buy a G50 car and put in a light weight clutch and flywheel and it shifts like an '80s BMW......... I am in the process of doing this, it's a big project.
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