So I've built a controller using an Inkbird itc-100 VH it works well as a controller but has a lot of internal settings and adjustments, some which help and some that took some time to figure out. Such as the differential which was set for 3 degree swing, but that was adjustable to 0, I chose .1 degree. Any way its all adjustable and works well. My plan was to use it to run my little giant 9200 incubator. The original setup of the 9200 swings quite a bit so I was going to turn it on full and run the power supply through a SSR controlled by the Inkbird controller. The SSR was a NO relay wich is the most common used and there is slight power bleed through the switch side when off. So come to find out I need a NC relay and to run the controller in reverse which the Inkbird controllers do.
Its a good controller as far as I can tell so far I'll let you know how it goes with the other SSR, if that doesn't work I'm going to get a common mechanical relay and see how that goes.
Good luck.