For sure. I hate this progression, Plateau'd for ages unfortunately. I started bodyweight Training mainly to obtain planche. Ironically it is my weakest of the 7 series by far. But i wont give up... i am probably going to start doing maltese board presses and spl negatives from hs and tuck pl pushups more to really hit the shoulder hard.
Every other series i am getting consistent progress apart from manna, straddle L is extremely difficult 