1G New Valve Seals Leaking

[LarryJoe]

So here recently I lost the head on my dsm. So I bought a used head off my buddy and ran it but noticed the valve seals were leaking bad. Verified by pulling the exhaust manifold and had large amounts of oil in the ports. So I replaced the seals with Vito std size seals. Checked for play in the valve while doing each one and they felt great. Well now less than 100 miles later I'm getting a nice puff of blue smoke on startup and sometimes just smoke when sitting at idle. Why would these be leaking again so soon? Anything else it could be I'm overlooking? Don't seem to have any smoke while cruising or WOT or when engine braking.