Looking for help with engine timing, M62TU

[MrFixIt]

Please recommend a reputable BMW tech/Indi--Kansas City area.

I'm looking for a BMW tech/Indi in the Kansas City area to help me do the timing on my 2003 X5 4.4 M62 TU engine at my house/garage. I have the timing tool kit, but would like to try a different one if you have it. I'm willing to pay a fair price for your time. I will have everything all ready to start the timing when you arrive. You show up and help me go through the steps. You are done when the timing is done. I can put the rest back together/close it up. The worse part about this timing design is that we don't know if it's done right until everything is put back on...what a pain.

Only redoing timing on Bank 1 (P0011 code, Bank 1 A over-advanced). I was advised that it is not necessary to open up and redo the timing on Bank 2. Is it better to redo both Bank 1 and 2 again?
_______________________________________

I'm throwing in the towel. Please help...I'm tapping out

Part 1: DIY, Replaced all timing chain guides, rebuilt VANOS with Beisan kit, etc. Put everything back together and engine started right up. Got a P0021 code "Bank 2 A over advanced". Rough idle and reduced power at low rpm. Drove 25 miles.

Part 2: Tore it down and redid the timing, both bank 1 and2. Started right up and ran ok for few minutes before rough idling started. Code P0011 this time, "Bank 1 A over advanced". Same symptoms, rough idle at low rpm; smooth at above 2000 rpm.

Part 3 (today): Opened up only Bank 1 and redid timing today. Started right up and ran smooth for only a few minutes before it went into rough idle at low rpm. P0011 code showed again, Bank 1 A over advanced. Runs great at above 2000 rpm, but very rough idle/below 1200 rpm.

This was a huge job, and overall everything went quite smooth; however, I am stuck on timing like a ground hog day.

Thank you.