I see your points here Lyle. I think it would take me a while to master what you're saying though.

1) I find it hard to duck and come up quickly whilst being on my toes enough to move well. Perhaps it's something I need to train specifically to make it physically easier.

If I'm not close enough when I duck their jab I find they will just hit me on the top of my head as I go down which is easy for them since they are already punching down.

As they are heavier I need to be able to step sideways as I duck otherwise they will just run into me and things get messy. Since I'm the lighter one I'll usually be the one who ends up most off balance after a collision.

If I'm not no my toes with excellent balance I can't step sideways but I find it's really hard for me to be on my toes and ducking at the same time.

2) The heavier taller sparring partners I have love it if I lunge at them because they know they can still reach me before I can reach them. I can do it sometimes if I see that they are off balance or when i'm using angles well but I don't find it easy at all.

Any more suggestions/advice to combat these issues Lyle?