Try not to be discouraged... don`t give up.
Being a big guy, you are probably drawing more than 28 inches, and thus more than 54lbs.
If you have not already, try getting close to the target, and shoot only ONE arrow at a time. Shoot at a VERY small target. Like maybe a 1/4" black dot in a paper plate, at say, four yards.
If you are trying to shoot instinctively, your concentration level MUST be EXTREME. It is just as
important as form in my opinion. It is also more difficult to learn than good form, in my opinion.
Shooting at a tiny dot may help.
If you see all your shots are hitting near the black dot,... back up a step. And so on.
If you find that it is hard to hit near the dot from up close with any regularity, then you may indeed be overbowed.
I just did this excersize with my son, as he was suddenly having a hard time hitting consistently.
After watching him shoot, it was obvious it was not his form. After a few days, his shooting improved greatly.
Whenever I begin to see my groups spread, I step up close for a few shots, and it always seems to help.
If you are experiencing discomfort when you shoot, or soreness after you shoot, then draw weight probably is a problem. The good news is, forty pounds of draw weight, and a four hundred grain arrow is good medicine for whitetails.
I urge you to not get discouraged. Sometimes the hill gets steep, but you can`t beat the view when you get to the top.
Don`t be surprised if twenty yards turns out to ALWAYS be a long shot. Targets don`t move and duck. I can hammer targets out to and beyond twenty yards, but I rarely release an arrow at that range.
Regardless of how good of a shot you become, or how fast you learn to shoot well, your new recurve will teach you to be a better HUNTER quicker.
Try not to be discouraged... never give up.