Mel, I never had issues with 32/40 but other highly respected rehabbers did so I changed to Esbilac and all seemed okay till last year.
What I experienced with Esbilac and neonates was horrific. Based on the description from those with the 32/40 issues my littles had the same issue with Esbilac. The ONLY reason they made it was due to a switch to Goat's Milk Formula by another rehabber after I handed them off. Yes, it was so bad and I felt so awful (complete failure actually) I handed my babies off to another rehabber to save after I messed them up. They all made it and were released.
Then come last Fall like an idiot I used Esbilac again (thinking it was just those babies)...nope, same exact problem so again I went to GMF and they made it. Keep in mind this is after they block up and I have to do the Duckman Treatment for 24-36 hours to reconstitute the cement in their little guts.
This year, like a fool I went to Esbilac and the little one died. (I do think he had other major issues going on, but he did bloat and he did die...those are facts)
I have since gone to GMF entirely for eyes closed babies 3 weeks old or less. A 50/50 blend of GMF/FV20/50 for 3 weeks till eyes open and straight FV 20/50 for eyes open (unless there are digestive issues and then I use GMF)
I am thrilled to share my babies are beautiful, chunky, little monsters. Far far cry from last year at this time.
Based on my horrific experience with Esbilac over the last 3 seasons, I will most likely never suggest it as an only formula again. I do think there is benefit to mixing the formulas. Colostrum is added to the formula and does not replace formula...at least that's what I do.
This change is huge for me. Although I live in an area that prides itself on farms and farming, acquiring Goats Milk here is impossible. I drive to Maryland to get mine or I schedule visits and meet ups with friends so they can bring me Goats Milk. It's not easy and there is a lot of advance planning involved to make sure I never run out. But the results to date have been undeniable. I've been converted!
The biggest thing I've learned in the last 8 years of rehabbing...you have to do what works for you, but you need to keep your ears open to those that surround you, just in case there's something coming down the line. You know, CYA.
I hope that helps maybe just a little bit.