Shikata there are two more sweeps in the Yip form or at least there were at one time. The form yip ching does now has some changes from the one I learned and yip man also changed a few things from his early days.
In the section with the double chain kick. Instead of 2 there were 3. The section startd with a low drag ankle kick then the front kick with tan sau then the knees snapping kick with bong then you gum then when you step in with the pak and low spade hand to the dummy trunk instead of stepping in to the trunk it was taught as a circle step to the back of the dummy leg with the foot raised on it toe. You step down with the heel in the back of the leg at the same instant as you change the gum to the low spade hand the pak is a lap.
Our form is similar to the Yip Form but with sections the yip form lacks. 3 elbow sections ,attacking kwan sau sections, triangle step sections, attacking bong sections, active bui sections, using bui to move outside and inside,more kicking and leg work sections.
Yip taught his early students the kneeling horse and its uses. Other wing chun styles have the kneeling horse as well. It is in our 3rd form and also there are kneeling san sik as well this is in addition to the last move of bui jee which is really more for showing a version of the bob and weave than for getting up from the ground. Yip Man never really gave anyone a good explanation of that last move. The getting up from the ground was WSL idea about its use.