16 Week Eiger Plan – Question About Repeating Weeks

I am a couple of weeks into the 16 Week Eiger Plan and have enough time before my objective to repeat weeks. From start to finish, I have 20 weeks. I know I will repeat week 13 and 14, and I’d also like to add a little time to my base period, since I feel pretty strong on my tools heading into training. My questions are:

What base period weeks should I repeat?
When should I repeat them?

and

Should I repeat weeks 13 and 14 back to back (13, 13, 14, 14) or repeat them as a pair (13,14,13,14).

Any other advice or tips to maximizing this plan would be appreciated.
Thank you!