IMO.
Forget the rolling loose and leaping about for the moment.
Start with both hands low near your left hip. As you swing your arms up and back/out, both arms will be contributing to the draw.
(Some people go high first and then come back/down)
There is a big difference between drawing to the chin, the jaw and then right back beyond the jaw for a full medieval "in the bow draw".
Bear in mind that 80# at 32" will be a lot easier to pull for the first 3/4 than a bow that is 80# at 28" as it isn't up to full weight as it comes through the 28" mark.
At short draw lengths (like to the chin) you are fighting the bow and holding the full draw weight.
At a longer draw your limbs can go 'over centre' (over center) like one of those toggle catches on a jar or suitcase.
I'll explain:-
Drawing to 32" you right hand/forearm can be pulling back high, on a level with your eye or forehead.
You reach a point where the right elbow starts coming down in an arc to end up with your right thumb near your collar bone. Coming down in the arc is giving you added leverage and that 'over centre' action.
Your elbow/hand moves down in an arc say 9" long, but only pulls the string back 3", that's effectively giving you a 3:1 leverage!
Another way of looking at it:- Your upper arm is acting like the cam on a compound! (spits on floor)
'This is called coming over the hill' (so I've been told... none of this is my invention, but it's stuff I've found feels good to me)
Getting that early bit of draw is about confidence and momentum.
When I was a young kid, all adolescent boys had Charles Atlas chest expanders
, you if you held 'em across your chest and heaved, there was no way you could stretch 'em
. BUT if you started with 'em down by your knees and heaved up and out breathing in and throwing yourself into it... oh yes!
Like most things its timing and confidence.
One last thing... it's always easier to draw a bow with an arrow on the string
...! You are focussing on the arrow/target etc, not worrying about 'can I draw it?' 'will I over draw/underdraw?' etc
BTW. I think the 'thumb under the back of the jaw' anchor is a good compromise. You can still use a slight 'over the hill' draw but your aim is still very normal. A full medieval draw feels mad, as you have no idea where the back of the arrow and your anchor is until you've done it a fair bit... then your eye/brain slowly zones in and you can hit stuff smaller than a barn door again.
Hope that makes sense.
Del
Regarding the rolling loose, very very few people do it right, it is supposed to be about loosing at the instant you hit full draw with added forward momentum. Some supposedly good exponents of it hold at full draw for an age and then leap forward in an exagerated manner long after the arrow has gone.
My advice, keep it smooth and simple, if it looks silly, it probably is!