Boost his confidence over jumps: Sounds like your leaning at the jumps. Don't go into position until he commits to taking off (Instead of a last minute or in this case already dead horse, squeeze your leg going to the jump and make his mind up before you get there. Make sure you have enough momentum as well. Not too fast but forward paced.). Try lot of poles, switch things up a bit and work with jumps as a figure 8. Set two x's up, one on either side of the long part of the ring with poles to it (Both sides poles lead up to the far end with the x at the end). Go over the first side then cross the diagonal after to continue to the second set then repeat to continue to the first (Creates a figure 8 pattern). It switches up the routine of gymnastics or a normal like course and gets him thinking a little more. Keep your x's small however, it's not about height, it;s about a goal. Do the exercise and for doing it well BE PROUD! Of both you and your horse. Be happy with small achievements and your horse will pick up on it.
Get him to round/frame: Ride off your leg. Make sure you use enough leg that he engages his hind end (Just cause the head tucks doesn't mean it's round, unless the buts properly in motion it's not actually round), use your inside leg to get him to tuck the head for a bit of inside flexion, use your seat to keep the gait slower, then not overdoing it, but lightly feel your horses mouth through your reins. Gently slide the bit back and forth if need be, but nothing huge or really anything to be noticeable. Just nice and light with the hands more than anything. If it comes round I had it explained it should feel like a pound of butter in each hand. XD One way of putting it but yup that and LEG. I wouldn't recommend doing this though without a coach or something (Just cause I don't know how advanced you are. If you already know how o do it cool, but if you haven't tried before you might want a professional there to let you know if you're ready for that kind of thing yet or not.).
Slow his trot: Slow him down off your seat. Instead of using your reins to keep him slower, slow your post, plan every step in your mind and ride it (Absolute need be, though I recommend you just use your seat and ride off your legs, mini half halts with your outside rein.).
Get him to bend more: This exercise you do at a halt. It's the simple hold the rein to one side till the horse puts his nose to your boot, give a pat then do the other side and repeat. It doesn't mean pulling or asking the horse to turn, it just teaches them to bend their neck in. Serpentine's are good as well as spiral circle exercises.