I would love to know how the new plants you acquired this year doing. Thank you. I find that own-root shrubs improve with blooming as they mature, except for some wimpy hybrid-teas that got weaker through my zone 5a. It sounds like you have neutral pH clay with Savannah, Madame Anisette doing well. Savannah refused to bloom in my rock-hard clay (pH 7.7) until I moved it next to the rain-spout dumping acidic rain water. The ones that bloom non-stop for me have vigorous roots and like my heavy clay .. these also have glossy & dark green foliage (such as peonies which love my dense clay). Right now my prettiest roses which bloom easily & nice-looking shrubs are: Amber queen (very glossy), Princess Ann (light green & glossy), Orchid Romance & Evelyn & Tchaikosky (all dark-green and glossy), Poseidon (glossy leaves), Bolero & Pat Austin (glossy) Prairie Harvest (glossy light green foliage), Savannah (glossy dark green), and Twilight Zone (lighter glossy leaves), Betty White (dark & glossy leaves), Princesse Charlene De Monaco (lighter green glossy leaves). The glossier the leaves, the more they can take poor-drainage clay and won't blackspot. I have a soaking wet & poor drainage clay bed that nothing lives (all the spring bulbs rot in there), but Kordes FlowerCarpet with shiny & glossy foliage thrive in that bed for 20 years with zero diseases ... Bayes blueberry also thrived with zero blackspots in that poor-drainage bed.