Thanks for the response. You're right... it may be the Long Term bond fund. In either case, I think I'll avoid the bonds for now since I can take on quite a bit of risk.
For now, I have my HSA investments allocated to VDAIX (0.2 ER). But looking at my overall Small/Mid cap allocation of just 14%, I believe this may be a little low for my liking. My HSA administrator, PayFlex, offers VSMAX (0.09 ER), would it be wise to use this HSA investment space to tilt my allocation slightly more towards Small Caps?