You can stop worrying about water hammer. Your mainline could probably run to the next zip code before water hammer became a problem. The problem with trying to read a table to get a number, is that you don't have valves that snap closed, and in the seconds during their closure, the flow is slowing down as well.
Thanks Boots.
Yeah I kind of went overkill on the 1.25" mainline. The consensus always seemed to be that the lower your keep the GPM the more reliable the system would be. I think I'll recalculate what happens to price and pressure when I drop to a 1" mainline. For my GPM it should be negligible. The valve closure time was definitely my struggle point. Some charts say to use .40 seconds and others say to use .10 seconds. I guess keeping it under 5ft/sec is all I really need to worry about.