Some sleeves have two brass components. The one I built just had one, so the lower limb is glued directly into the steel sleeve.
My sleeves started out tight, then got too loose so I built it back up with JB weld and re-fit them. My wood was wet I think, then shrunk when it dried and believe it or not took the brass with it (as it has not separated from the sleeve that I could tell. It has held up fine, although I ain't looked at the bow in several years. When they suck up moisture and get tight it can be a real peach to get them apart. Worse yet, in the very dry winter if too loose they'll kinda click on you early in the draw.
Looks like you are off to a great start.
Why do you not want to loose the deflex?
It's not as bad as set, but it does nothin for the performance of the bow, at least not in the form that limb has. Ideally you'd put it on a caul or rig up some apparatus at this point, put some heat to each limb and clamp them into about 2" of nice even reflex. Then tiller that reflex back out, leaving a nearly straight bow.