Doug, that's a great philosophy! I can also relate to the problem of high poundage. I have a 60# @ 27" Custom Bighorn that I love, but I just started getting serious this year. So I went on the bay and got a 45# Bear Grizzly and now I'm having fun, building my strength, obtaining good form!
My own opinion of the grouping at 20yds, yes and no. Sometimes I can just about split my arrow or hit within 3" at 20yds, then an arrow will go 1 or 2 feet left or right.
What I figured out today(after much studying Masters of Barebow), that I really have a lot of blind bail work to do on each aspect of the shot. There's many things going on in the mind right now, such as drawing, body position, anchor, bow tilt, moving my draw elbow back with back tension(expansion per Rod Jenkins), and last but not least...Concentrate on a super small spot that I intend to hit.
So, I also learned, I just need to relax and Shoot, so I did. I was shooting big 3' wide bales today and every so often I hit right were I was aiming. Well, standing from the side(45deg) I decided to shoot the side of the target, which is only 1' wide between 2 4x4 post. 1st shot was right in the middle. 2nd shot was right on the post and cracked my new PO Cedar in half.
Right away, I realized what happened, I wasn't focused, I let the arrow before get me out of the zone. From then on, all I did was shoot between the post 1' apart and this increased my attention span 10 fold, I was so focused cause I wanted the arrow to land right between the post..."become the arrow" kind of attitude.
Try putting in a days work on building some wood arrows, then go shoot and have one break...it'll make you cringe!
With respect, I recommend shooting between trees, or at least small limbs to tighten focus down and challenge yourself to really focus and "become the arrow".
Good luck!