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Nic,
You said you replaced the whole assembly. Did you replace the balance wheel with one from another watch? If so does the replacement balance wheel have the same weight and inside and outside diameters at the rim? Does the balance wheel and hairspring vibrate at the proper frequency for that watch mechanism (probably 18,000/hr). Have all frictional obstructions have been removed such as dirt, gunk, part to part contact and so on. Did you demagnetize the movement? Is the hairspring clean? You are in an aspect of repair where a timing machine could be extremely useful. If you do not have one they are not terribly expensive.
david