Hi Natalie,
Choosing the best variety of cherry is very difficult. The productive behavior can vary a lot with the climate and the terrain, the producers in the area are the ones who can best advise you. In areas with a significant risk of rain, varieties that are not very resistant to cracking are best discarded, regardless of other factors.
Lapins should pollinate Early Bigi well, if some flowers escape they are lost, no problem, the other cherries will be bigger.
My experience with Black Star is that maturation it is later than indicated by the nursery (you have to take it black to have an excellent flavor and release the tail well). I think that the Samba variety could be interesting to integrate in that plantation, although it is impossible to assure that it will go well. If the intention is to continue growing and you have the possibility, I would try planting individual trees of other varieties to test them in the field.
Greetings

My question is this
Will the Lapins also fertilise the early bigi (i dont see this on your site but thats the info they gave us)
Also we want to plant another row of 35 trees and were wondering if there was another variety that would fall well within this picking range or which of these do you think we should double up on?
do you think these are good varieties?

We are situated in Central Portugal
THanks!