My sister's tomatoes are all curling up and not much tomatoes. The top of the plants look like thay are dying off. She feeds them too, planted in compost mixed with well rotted horse manure.
There are multiple articles about tomatoes at this link: http://www.google.com/cse?cx=012078378210706707791%3Af1h5n_k1r5e&ie=UTF-8&q=tomatoes&oq=tomatoes&gs_l=partner.3..0l10.210290.216665.0.2175126.96.36.199.188.8.131.527.858.0j4j1.5.0.gsnos%2Cn%3D184.108.40.206.6480j22373058j8..1ac.1.s3h0QoGKoaM#gsc.tab=0&gsc.q=tomatoes&gsc.page=1
This articdle discusses leaf curl of tomato plants: https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-leaves-curling.htm