I think that's too many arrows to shoot in one sitting.

Perfect practice makes perfect.

As you fatigue you're form will suffer and muscle memory may lock in that bad form.

Try this. For your first five shots of the evening get within five yards of your target, close your eyes and completely concentrate on your form. Concentrate and a nice slow, steady draw, relaxed grip, anchor, balance and a slow squeeze of the trigger. You're trying to get the feel of what the perfect shot feels like.

Just like in rifle shooting you're trying to get your mind in a place where the actual shot surprises you. With archery tackle the bow should almost "jump" out of a relaxed grip.

I would then put one arrow down range at each of the different yards. This is good practice at making that first shot count which is most likely all your gonna get. Maybe switch up each day between standing and kneeling.

After that I like shooting at long range as this allows any form errors to be amplified and also makes those 40 yard shots super easy. For me it also seems that if I'm only shooting 20 or 40 yards I'm trying to hard at robin hoods while at 70 or 80 yards I'm just concentrating on form. Love the pie plate groups at 80 yards over f'ing up arrows at 20 yards.

Crack I tell ya