Summit Power Brake Conversion Issues

[yernkie]

I just installed the Summit power brake conversion kit (SUM-760197) on my manual drum 1968. The install went pretty smooth but I am having issues with getting everything dialed in afterwards. After bleeding, the pedal only has an inch or two of travel and it stops fine at low speeds but will not stop it over 40 mph. It feels like there should be more travel in the pedal but the rod looks like it is going in to the booster as far as it will go and nothing is binding up. Could there still be air in the lines or master cylinder? What am I missing?

I am not running a proportioning valve because Summit told me I didn't need one. I have the back brakes on the front port (closest to radiator) and front brakes on side closest to firewall, again per Summit.