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Forget the 'just off the lands' stuff until you have a load. The 'just off the lands' thing is a load tweaking technique that is entirely trial and error. Every rifle has a different distance it prefers. And you're limited to 'fits in the mag length'.
"...they shot low..." You can forget that too when you're working up loads. Only the group size matters. Where it hits does not. That comes after you've found the load your rifle likes.
You may find your M70 doesn't like a floated barrel too. A floated barrel guarantees nothing. This isn't a big deal though. There's no way of telling if a particular rifle likes it or not except by trying it as you've done. Once you find the load, you can try a pressure point by putting a couple layers of match book cardboard under the barrel about 1 to 2 inches from the end of the forestock. If accuracy improves use a bit of bedding epoxy to make it permanent. The whole thing is about consistency though. Not so much about accuracy or small groups.
53 grains of IMR 4350 is below the current minimum for a lead cored 165 according to Hodgdon. (Isn't for a solid copper bullet.) However, your rifle appears to dislike IMR4350 anyway.
IMR4064 is your friend. It gives more consistent accuracy than most other powders.
Anyway, you need to work up the load, not just pick one and hope. The start load of IMR4350 and a 165 is 56.0. Load 5(mag load) and go up by half a grain to the max load of 60.0(Compressed). (Compressed loads are nothing o worry about.) keeping 'em separate. Then go shooting off a solid bench rest at 100 yards, using a sighting in target(the one with the inch squares) for group only. Shoot slowly and deliberately and allow time for cooling between strings.
Oh and Hornady Superformance ammo is their current name for their old(few years ago) 'Light Magnum' line of ammo. Really just 'Max load' ammo. Not that it matters.
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