400mm f/2.8L IS II Replacement Lens Feet

I'm picking up a Canon EF 400mm f/2.8L IS II USM tomorrow and was wondering which replacement lens foot to get.

What I want is the ability to use the replacement as a handle and the camera to remain in balance on a Whimberly head.

Optionally it should work great on a Mongoose 3.6 if I decide to upgrade.

My shortlist on lens foot are the following.

Kirk LP-55
RRS LCF-53
Wimberley AP-602
4th Generation Design CP-40

Incidentally I wrote a review on the 400mm at http://gearpill.com/elite-review-can...-8l-is-ii-usm/

Being able to test the 400mm three months ago made me place an order. It is the best lens I have ever used.

I purchased the RRS foot and it works fine.
mike

Thanks mike on which gimbal or monopod are you using it with?

Wimberly2 or 4D Mongoose on Gitzo tripod.
mike

Tested the 400 with the Wimberley P-50 and found it short towards the lens mount without the 2x extender and hazardously short with the 2x and 1D4.

I guess this also applies with the Kirk LP-55, Wimberley AP-602 and 4th Generation Design CP-40 as they do not have enough plate area to clamp upon and yet maintain balance. This gets worse when you attach a 580EX II.