PTP Design for MPLS Network - Need Advice

Hey there, I was hoping some of you more knowledgeable people might have some suggestions on PTP designs for MPLS networks.

Background: 300 router network: Nokia 7750-SR7/7705 SAR platforms. Fiber(1gig, and cwdm/dwdm nokia 1830) and various microwave for backhaul. Utility with lots of TDM we still need to migrate.

Our timing is currently mixed with Sync E and BITS at key microwave sites as well as ptp. An EX-coworker somewhat implemented PTP by getting two grandmaster clocks at separate locations and setting one as a primary ptp source and one as a secondary ptp source. All the nodes have a ptp reference but it is the secondary on a good number of routers(with Sync E or bits being main). Our clocks also keep shifting resolution between 100ns and 25ns but that's a separate issue.

Does anyone have any tips or resources for PTP clocking design?

With the Nokia gear you can set a device up to be PTP source and then create slaves but this is very messy and would require us to have a number of sources based on location.

We need the timing setup so we can do our TDM over the mpls. As it sits now we have migrated very little due to timing issues.

We are in contact with nokia to try and figure out the best way to move forward but I was hoping someone could point to some resources or offer any first have experience.

Thanks!