Your screenshot is not very useful because the groups.io resized it down far enough that it's hard to read.
Anyway, you have 76 second periodic error just like me, and also everybody else.
PEC will not fix it.
There are a few possible ways to address it:
0) Send it back to Losmandy.? Get it back in an unspecified amount of time.
1) Reset the bearing blocks, as per Losmandy's Youtube video.? Maybe the block will realign and this error will be reduced.
2) Shim the block to change alignment (too much trial and error)
3) Michael Herman Belleville washer fix.? (This was the solution that finally worked for me)
As for DEC backlash, I have a very long post about how to adjust it
/g/Losmandy_users/message/71205
