Finally decided on a cam for teen SB. Should I bother with header?

Had the cam installed. Initial timing set to +14deg, 34 total. Runs good, up until about 85 mph, and then it was like I was running out of gas and could not go any faster. Did not really hear a ping, just falls on it's face.

Dialed it back to about +10 deg intitial, run it again, and it made it to about 95 and then hesitated.

Is this normal for this cam and my hardware?
Where should I be?