Please consider mixing fv 32/40 with esbilac with an expiration date of 10/21 or later and heavy cream. I have raised about 80 of them so far this year and had no issue. I used the zoologic 33/40, but it is hard to get right now. The Esbilac is very close and works nicely in the nutrition calculator.
Once on this formula it is used from pinkie to weaning and is far closer to mama's milk than fv 20/50.
If you have trouble with constipation again, try adding a bit of molasses to warm water and giving.