Berm, you're peaking at 5900?
Something is up. Were the durations you quoted advertised durations instead of .050"?
That cam is way too big to peak at 5900...especially with excellent flowing heads like the 205's.
You guys with flat tappet cams need to get out of the 60's and into modern technology.
There are several engine builders on Club Cobra.....ask all of them what kind of cam they prefer and which one is the easiest to install/break-in. Not one of them will say flat tappet, unless it's for a race class that mandates flat tappet stuff.