I'm still working on my 87 325is as well. 5spd
I love it.
I heard redline racing oil does wonders for smoothing out shifts.
My mechanic (Bimmer Doc) has a custom blend he uses. I havent picked some up from him yet but II'll post the mix once I find out what it is. (if it works)
Ive also read about the plastic bushings/parts wearing out in the linkage.
I think bavarian autosports has a linkage rebuild kit.
I might just go with a full short throw kit with the new parts.
You can do your own valve adjust. My mechanic sugests going a bit looser than spec. Ive read a few post from people saying doing it themselves wrked great and only took 2 hours. I tinkered with one but havent gone through all my valves yet.
Got other issues. fuel pressure regulator I think.
I have a haynes manual and it doesnt tell you how to do it.
I think the bently manual describes the procedure.
Other wise search for a good post, I found one with pics (somewhere).
Look for vacume leaks as well.
and loose bolts.
You should hear all the fuel injectors operating as well.
You should electrically/mechanically test all your sensors too, Mass air flow meter, throttle position sensor, temperature sending unit. idle control valve in particular. fuel presure regulator. etc
Get good Bosch BMW OEM replacements stay away from rebuilt MAFs cheap raftermarket parts. Ther are some good high perfomance aftermarket parts too.
Thats my thoughts for now.
Good luck, have fun
Listen to Starmavin hes great help too.
I'm no professional.
'87 325is Delphin Metalic