When i did C-41 i found it easier at ambient temperature, increasing the times. I used the nova press kit, which also includes a table. I find the chemicals alot more tolorent at 20 - 24C than higher. 24C i usually develop for 7:30 minutes. Blix isnt as critical as the developer, i prefer to use a stop bath also. Tetenal chemicals (2 bath) seem to hold up well at 24C for me aswell. I use tank processing. The rollei (agfa) and Fuji i cannot comment on. You might find it easier to go down the room temperature (20C) route, if you do not mind increasing the times. Experiment