Mr Lincoln is exceptionally sensitive to the soil temperature and they hate drought. To defend them from catching diseases which a lot of dark colors roses do too, you have to mulch them properly. By mulching them, you reduce the chances of watering them too much and keeping the soil temperature cool.
Besides, roses do not prefer clay soil, especially hybride. I suggestst you to get some "rootsgrow" products, that contains Mycorrhizal fungus which helps the plant to establish much more root structure. Giving a few couple spoon of Epsom salt will add to the help too if you do not have the rootsgrow but do not add both as Espom salt will kill the Mycorrhizal fungus instantly.
Hope it helps.