I discovered a way to create a tuck planche. When doing dips, at the apex of the dip, I roll my shoulders forward and lift my hips up - I build shoulder strength by doing that. I find it more effective than doing frog stands. Frog stands don't help me much.
From there I can either extend my legs backwards to work towards a straddle planche or extend my legs forward in front of me to achieve a L-straddle.
My current problem is I couldn't lift my hips up to shoulder height. At the moment it is just under it. Shall I keep doing sets of hip lifts and eventually I have the strength to raise my hips higher than my shoulders? Thanks.