Straddle planche for 2 months ?

Hi,im 24,my height is 170 and my weight is 70 kilos.i want to get the straddle planche till 1st of july.Currently i`m stuck on advaced tuck - like 10 sec,and croocked straddle planche for 2 secs.I used to do a lot of floor flips and stuff,and my legs are really big.When i go for straddle planche my butt is high,my sholders are leaned forward enough i think.Where i`m missing strenght ? What should i do,and should i lose weight and how much ? Please,give me some advices,and is the time enough ?

How is your planche lean work? Good form and stable?

i`m leaning like 45 degrees angle i think the form is clean (advanced tuck).

Different movement. Planche leans are not the hold you're doing now. Look them up, few posts around here about them,