Is your crankcase overfilled? What has your plug inspection revealed? What symptom prompted you to use the sea foam? Is you air filter/housing sitting in a bath of oil?
I'm just guessing until the technically advanced come along, but I would suspect oil coming through the breather and into the intake or worn valve seals leaking oil through the stem.
2013 V Star 1300 Deluxe
OEM Tall Sissy Bar
Memphis Shades Fork Deflectors
Bridgestone Exedra Max Belted Tires
Baron's RSTD 7308 bar