Bent arm Straddle Planche Hold

I am on the 9th week of the Frog Stand progression and feel like I am starting to stall/ regress on my ability to hold the integrated mobility portion in between strength sets (10s Bent Arm Straddle Planche Holds). This started last week, so I decided to repeat weeks 4-8 again beginning this week but still feel burnt out by my second iM set. Any suggestions? Is this common?

I've been progressing the sPL iM's as if they were a 10s PE, and that's been working very well for me so far. 

Joshua Slocum said:

I've been progressing the sPL iM's as if they were a 10s PE, and that's been working very well for me so far. 

I like the idea. I think I will implement this for a twelve week cycle and then combine the frog stand with it when I'm dialed in.

Thanks for the advice!