Agree with brycey...id yank that back farther,and farther than the 21" you stated as long as the tiller is still ok. Go inch by inch tho carefully montitoring your bend. It could change from what your showin now. Top limb might have a slight subtle hinge in the outer limb...it might show more if pulled more so be careful if ya do...ya might have to scrape it somemore. But yeah...that thing could handle 26-27" if handled n tillered correctly.