SP1 and SP2 get connected to the shield, I see what you're trying to do but you should'nt name them SP1 and SP2 otherwise people might try to ground themIdk if you mean the naming convntion of sp1 and sp2, but I have just referred to the positive points on the capacitors as such, since i've seen those names around the internet. otherwise no, those exposed pads are the drains on the mosfets.