i have been using bags of composted cow manure for several years now combined with bags of peat but not always. Who really knows how much manure your getting in those bags anyway? If nothing else at least its good dark soil.
Only problem that could be called summer sickness that i have had is with Laura Harwood. Its a late mid bloomer and a lot of the leaves have yellowed and the scapes are short but loaded with buds and is now blooming good. Not going to move as this year i plan on a regimen of milorganite for all my beds and the yard as well.