Trying to shoot 170lbs

[bowman123]

I am trying to shoot this massive 170lb@32" bow but I just can't get it to full draw.
What do you suggest I should do?
I can do 140@32" with a fiberglass recurve
but This bow is so heavy for some reason I can't even pull it to 27", which is only around 130lbs@27"
Why can't I pull it to my max potential draw weight comparing with that recurve?

Video of my technique trying to shoot 170lb longbow:
https://www.youtube.com/watch?v=NxPSuWebbKc&list=PLmbsjmhL9gQcrjSEpFZejUqXD0Y9aZelt&index=5

[GlisGlis]

I' put my feet on the handle and grab the string with both hands 
it is not guarantee of success tough   

[Eric Krewson]

When you are my age (72) and stuff you did in your youth comes back to haunt you physically, perhaps you will wish you stayed with the 140# bow which after all is very impressive to us old guys. 

[Hawkdancer]

See your orthopedic surgeon!  And listen to your elders!  We been there, done that, and don't recommend it!  Eric is right! 
Hawkdancer

[BowEd]

Heck of a stick.
You'll have to figure out a strenghtening regimine strategy to be able to pull that bow.
Nothing wrong with and a good goal that but to avoid injury it'll have to be done.

[Bryce]

you need to engage your back muscles to aid your shoulders. mid draw, draw your shoulder blades together and extend your chest.

[BowEd]

Agreed.

[Little John]

After you cripple your elbow and shoulder you wont even be able to shoot a 60# bow, not worth it. you had best have good insurance to rebuild the tendons and torn muscles.

[PatrickH]

I dont know how to help with that (I can't get anywhere near that weight of draw) I saw some of your videos on youtube though, cool stuff man. Be careful but also it is fun to see what draw weight you get up to.