First shots with my nikkor 300mm f/4
Great lens, but I finally got fed up with the lens foot and replaced mine. It was driving me crazier than I already am
Not a Nikon user, but I had the same problem with my Pentax DA*300mm tripod foot. Too small to act as a grip when carrying around.
What I did though was buy a cheapo (£15) long Arca-Swiss plate, about 115mm, and fit it to the tripod foot and it acts as a great grip when carrying casually, and also provides a very effective palm rest for steady shooting. Also means I can then transfer it to the tripod very rapidly when needed.