It is interesting how much difference can be in the performance data you have to use. Im flying the old 733 for 6 years now and we changed the way we calculate our performance only once with interesting differences in what kind of figures we got before and after.
We used to use BA performance where we used a BA performance manual and a speed booklet to obtain values for V1/r/2. V1 was always the same as Vr except a very few cases especially with contanimated runway or reduced braking action.
After BA sold our company we changed to a swedish performance data supplier and now get very different V1 figures, most of the time around 15 to 20 kts lower than Vr and quite often regulated by Vmcg (which wasnt limiting in most of BAs performance). Nothing has changed with the airplane, our SOPs or the route network we fly but we still use very different V1 figures now.