Wouldn't shortening the stirrups a hole or two help? It seems like your leg is really long for jumping.
My instructor had me practice two point and jumping position before even going over a ground pole. Then the same while going over a ground pole. I just did my first teeny tiny jump last week and it was great. I could feel the right position and hold it so much easier because of the prior practice. I could also ride straight to the fence afterwards without much bobbling on his or my part.
But, I am a newbie at jumping (and have some confidence issues), so grain of salt and all that.
You look like you are on your way though and should progress nicely.
ETA: in the last photo you posted, his front pasterns are a bit concerning. Does he always stand and have such a broken angle on those fronts? I only ask because continued jumping could only cause additional issues and weaken those pasterns further. But, it could also be he was overdue for a trim (my mare can look the same and I even had folks swear she had DSLD. But, she hadn't been getting proper farrier care and has excessive weight which caused those angles to look very weak.).
Last edited by gibby; 06-26-2015 at 10:58 AM.
Reason: Deleted a word and added ETA section