Hi,
Tough call.
Since you have het pied and het albino females I'm not sure you would get a lot of advantage to breeding a clutch of 50% poss het pieds and holding back all the females, or having more female het albino's.
But it really depends on your long term goals - doing the above you would have more chance of extra recessive offspring with only 3 years to wait and you would know the full history of the animals. But they would also all be related to the males you have.
Personally I would think about running the pastel through all three breedable age females and possibly exchanging, or selling, the offspring to either get unrelated animals of the genes you already have or possibly even adding more varieties.
But in the end it comes down to what you really plan on long term.
dr del