Some of those "better conditions" objections are pretty specious anyway. For example-
The oak tree was out of the way by, what, Z210? If you want to duplicate LHO's timing and accuracy, then it makes no sense to impose an obstacle on the re-enactors that Oswald didn't have by the time he began his shooting (or at least by the time the first effect of any shot can be seen).
Taking these two together (a little out of order, but the same idea applies to both)- I'll admit, I'm no rifleman, but it seems to me that these "better conditions" are actually
worse ones. As a very crude analogy, shooting a fish in a barrel is harder if you make the angle shallower, shooting more across than down. As for the "stationary target" thing- because Oswald was shooting at that steeper angle at a target moving downward and away in effectively a straight line, his target was, in fact, relatively stationary in respect to him- his own movement was minimized. But shooting at actually stationary targets, at different distances at a shallower angle, means that that the rifleman-
the re-enactor- had to move to compensate for the target not doing so. And remember, these re-enactors, unlike Oswald, weren't familiar with the action of the bolt of the trigger- from
here:
To sum up- re-enactors having to move themselves and a rifle they were unfamiliar with to simulate the movement of a target is not a "better condition" than Oswald firing a rifle he'd practiced with at a target that was in a position throughout which minimized his own movements.
Next "better condition"-
They could have been ten feet square for all the difference this makes- if the issue is accuracy, then the placing of the hits is what matters, not how big the surrounding area is.
This whole "shims" issue is a red herring- from what I can understand, they were placed because the rifle,
as received by the labs, was difficult to test in that condition. But (from
here, near the bottom of the page):
(My bold)
So the "shims" issue is framed as a "better condition" only on the assumption that the rifle as received, and needing correction for testing, was the same as the way Oswald used it.
Finally-
Gotta love this one. Not only does it assume that the "pressure of killing a President" would have been a significant obstacle to Oswald in achieving what was, after all, his aim- the idea seems to be that the only equitable condition for the re-enactors to duplicate the accuracy and timing required to kill a President would have been for them to kill another one. I can just hear that conversation with LBJ-
"Mr. President, would you mind awfully going back down to Dallas for a bit and riding down Elm St. in that limo?...Well, sir, we need to re-enact as exactly as possible the conditions of the assassination, which requires our enactors to fire at a President in the car...Well, yes sir- live fire, actual bullets and all that...What's that, Mr. President? Suck your
what?"