Not entirely sure that I understand your question but, presuming that you are concerned about a very light weight takeoff with a resulting min speed schedule which is too low, and for which the VR is still giving an unacceptable V1, then the situation is -
(a) min speeds for V1 will be limited by Vmcg
(b) max speed for V1 will be VR .. which in turn relates to V2
(c) to up the V1, we need to up the VR and V2
(d) the max VR/V2 will be limited by the available runway, obstacles, etc etc ...
(e) the simple solution is to look at the RTOW chart/table for the particular runway and increase the speeds (or weight, if you prefer) so that the speeds you choose correspond to a weight which is not more than the max weight in the tables. This should work for most aircraft unless there is some strange handling characteristic referred to in the OM.
One thing to keep in mind in the very low weight situation is that Vmcg (FAR rules) is based on nil wind. If you have a decent crosswind, it is advantageous to increase the V1 somewhat (in a similar manner to the above) to increase to the realworld Vmcg as opposed to the certification figure.