My F1 is 'OK' although occasionally she sulks and goes past neutral leaving you to flick up and down a couple of times to get it, but thats the same as I remember when I had one new. Clutch drag is the most likely cause, I would be tempted to over adjust it temporarily just to see if it improves if not, it is likely to be a problem in the gearbox and as that it an engine out and strip I guess it depends on how bad it is.
Have heard of selector shafts causing 'sticky' shifting by being slightly worn or undersized, is it a high mileage motor?