[G-spec]

actually Slicer thats a hella good tip there that video you posted, that's pretty much what I do before games, I start off taking easy little baby jumpers all around the paint area, then I move on up to the free throw line work that and the elbows as well. Then once I feel my shot is really warmed up and I have a good sense of form and distance, I start going out to midrange and eventually finishing my pre game warmup with 3 pointers.

This helps my shot in games tremendously, if I don't do this before games my overall shooting percentage goes significantly down. I know the difference well because for some games I arrive late no time for warmup and I can definitely feel my shot being more than just a bit off.

Ray Allen for example shows up 4 hours before game time just to shoot jumpers and get comfy and loose in the gym, he's always the first player in the arena, and we know what kind of shooter he is, lol, the second greatest right after Reggie Miller.

And another useful piece of advice I will give the OP, is if you feel your shot is shit at any point, what really helps is actually taking a few weeks a month off from basketball or shooting, you can still play ball just dont shoot jumpers.
I do this from time to time and what it does for me is it basically resets my jumper to it's natural form, I have a tendency to get fancy with my jumpers often which throws my form and percentage out the window, so I just don't play ball for about 2 weeks then when I shoot those first few jumpers it feels weird and awkward because I havent shot the ball in a while, but only until my memory kicks in and basically reverts my jumpshot back to normal and I'm good again, try that as well it really does work for me and I do it every few months.