So when I shoot any longbow I slap more my forearm on every shot. Shoot my recurve never touch it. Same as when I shot a wheelie bow never touched it. Any ideas on why. I feel my forms the same. Not sure, any help would be great.

Thanks Greg

First thing I would do is increase the brace height.  Works for me with my longbow.

Maybe your wrist is rotating with your longbow

Check your wrist and elbow

You should be shooting your longbow just like you shoot a recurve.  If you are taking some folks advice and gripping it, you will probably have wrist slap.  What kind of longbow?  Is the grip dished or locator, etc.   Mostly it's just a form issue....like that darned gripping thing.

i never ever need an armguard, even for low braced hill longbows.

grip the bow's handle lightly between the web of your thumb and forefinger, with the majority of pressure at that web and on the thumb/palm flesh, and angle your bow hand - don't grip the bow vertically.