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There are too many things that can cause nock kick, the target being a big one and, until the arrow approaches tuned it’s all too easy for the arrow to slap the riser, giving rise to a nock kick, especially if your release is less than perfect. When you’re tuning an EFOC arrow nock kick is not even considered; all you are concerned with is whether the point of impact (group center) is right or left. If you have one of the Beman 400’s that is still full length try bare shafting it with the point weight you’re using now. Shoot at 40 yards again and let’s see what you get.
No, you don’t want to add a footing. Footing your shaft would stiffen the shaft, because it shortens the ‘working section’ of the shaft. You need to weaken the dynamic spine. At the shaft length you have now you need to put a heavier insert in, or an add-on weight behind the insert. I think you might already have your shafts too short for the point weight you are using. That’s what the left-impact is indicating. If you have a slightly weaker spine shaft available you might try it too.
Ed