Rolex 3135 running mega fast

[billsbuddy2]

Some of you watch techies may shriek in horror by this post but I will give it a go! I recently bought a 16233 DateJust case and movement off ebay that was badly damaged. I replaced the parts that were required and bought a 2nd balance wheel complete without the hairspring as the one I have seemed to be OK. I fitted it to the staff making sure that the end of the hairspring stud lined up the opposite end with the roller jewel underneath. I ensured the spring was level and not touching any part of the balance wheel.
Once placed back into the reconditioned movement I noticed it gaining about 5 sec per minute! I ensured the position of the regulator (not a true regulator on Breguet hairspring) was central as possible for equal oscillation.
I then noticed that the hairspring was not centered so I reshaped the hairspring carefully to ensure that when lining up the stud to the balance bridge it slipped in without deformation (I saw this on the official Rolex video + I found good quality photos of this hairspring to give it a go. The shape was out for some reason but the hairspring was flat). I fired it back up and the gain is exactly the same. I read up about demagnetizing watches and indeed the movement especially around the balance was active on the compass. I have a demagnetizer for tape heads and read that these work fine. I did this and the compass no longer responds but guess what? No difference in speed. The movement is on a fast train. There is no point in adjusting the balance wheels weights until there is a reasonable reduction in speed or have i got this wrong?
The balance is true and seems happy in motion. It's just the excessive speed. Can anyone suggest something other then taking it to a watch maker just yet? Thanks in advance