The heart of the problem lies in the fact that the 901,911, and 915 use Porsche sychros while the G50 uses Borg-Warner style sychros which as you noticed shift much better. You can make sure your clutch is properly adjusted and that you're running Swepco lube, these helped my 911 tranny immensly. Like the Mikkel said a G50 is possible but $$$$. 
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Email me about 911 exhaust stud repair tools, rsr911@neo.rr.com
1966 912 converted to 3.0 and IROC body SOLD unfortunately 
1986 Ford F350 Crew Cab 7.3 IDI diesel, Banks Sidewinder turbo, ZF5 5spd, 4WD Dana 60 king pin front, DRW, pintle hook and receiver hitch, all steel flat bed with gooseneck hidden hitch. Awesome towing capacity!
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