Spent all weekend there and never spotted you guys.
Putnam is one of my favorite tracks. It's pretty simple and easy to find a fast line quickly, but finding that extra 3 tenths of a second is a challenge there.
Took a quick look at your video and I see a possible two seconds you're leaving on the table. Turn 1, like Max mentioned, your turn in is too early. You should be braking till and just slightly into the turn in point. If you touch the curbing anywhere before the last 4 feet of it, you turned in too early. and you should be on the throttle well before the inside tire clips the apex. After the apex you should be carrying enough speed that the car is dancing all the way to the edge of the track before turn 2. Turn 4, this is the tough one to master. You should be entering midtrack, straddling the crown. As you turn in the car will step out, it's a matter of countersteering and full throttle that gets you through. Your line is the safer yet slower one. Each lap you should enter another foot or so away from the inside curbing. You will find the optimal entry point one lap before you spin off into the grass (not recommended untill you step up to HPDE 3 or 4). Turn 8 (Dead Bear), Try staying mid track untill you can see the inside curbing, then turn in and clip the last 3-4 foot of the curbing. Your exit was perfect but you'll be able to carry much more speed through it if you apex much latter.
Hope to see you guys at Mid Ohio in April.