We love Spades, they are a blast on UL/L tackle an taste great.
We rig for Spades with a #4-#6 kahle or mosquito hook and a rubber core sinker just big enough to take the bait down. Bait with squid, shrimp, bits of jellyfish or even shrimp Fishbites.
I scale/gut and cook them whole, olive oil or butter, some garlic & salt, wrap in foil and toss on grill for 3-5 minutes per side depending on size.
Too many bones... Huh, where? Meat comes right off the bones.
I've taken it off the bone, served it and had people ask if it was Flounder.