I think the reaction is too bad to continue.
On the upside, my super-ultra-hyper-sensitive Boo who took 4 months to get used to WK, already has firm stools on the Evo after starting him "cold turkey". I dunno.
Jemma's a bit more soft, but still- they're doing better on the evo so far than they were doing on the "hardly" changed SG formula.
I hope Buster gets better soon...