Well even if the flow doesn't increase at .800 lift the port will see more area under the curve since the valve will be open higher and longer. We'll see what the dyno says.

Here is a shot showing a standard Ti retainer with a +0.050 lock. This gives me 1.985 installed height and the Jesel rocker arm clears. I might be able to run this setup since it is just a hair under the recommended 2.00 installed height. The springs coil bind at 1.100 so there would be 0.085 clearance at full lift.