I am not much of help here, but had to tag this thread because I am in the same predicament:

>Just bought a used D700 with MB-D10 grip
>I want to take advantage of the 8 fps rate
>My MB-D10 came with the Eneloop batteries (select HR as battery type)
>I would like to try birds-in-flight using the D700 with my 300mm f4

In another month the flocks will be here at the Bosque Del Apache (NM), I will report back with my findings.

to the OP, a gimble head is very helpful, if you don't already have it for your Feisol.

goodluck