What you've described sounds a lot more like defensive strikes to me (they also quickly go into the S shape for defensive strikes as well). Defensive strikes are not meant to be accurate, but they are meant to frighten off a predator (you). Especially when you described him looking like he wanted to strike your hand through the glass. Even my hungriest animals don't strike at the tub when they see the heat from my hand or body from the outside. I only have strikes at the side of the tubs when the animals are feeling out of sorts or threatened in some way.

OR - you didn't properly heat up the F/T item to give him a good heat signature to aim for. They use their heat pits more than their eye sight for zeroing in on the prey item. Which is why they are still so accurate even when in full blue.

No - do NOT offer again tonight. If they refuse, you should wait a full week. You can stress them out by offering food too frequently.