First of all, I hope that you know that that is the cyan and magenta - they should not have cyan and magenta ink in them still... right??
Printers respond quite a bit to humidity. Buy a cheap hygrometer that is digital and put it near the printer. If you remain with at least 30% humidity you should be ok. Epson recommends 35% but it is hard to keep in the winter without using a humidifier. We run two large humidifiers in our studio to maintain 30-35% humidity. If you fall below 30% you will experience more frequent head drying out according to Epson. We agree!
Keep the printer clean. I would never start my day of printing EVER - without first running a nozzle check and cleaning the heads if necessary. This is standard practice if you are doing anything for pay - or you are printing for yourself using a critically important application (such as what you are doing.) This is done for no other reason than maintaining control and quality and consistency.
Then during the day you print out nozzle checks because they take 30 seconds, can be done on paper that costs a penny. Think of it as keeping a knife sharp, the oil in your car at level, a sensor on a digital camera clean, a lens clean, clothes neat and tidy, weeds pulled from a garden, a toddler's room safe, or anything you practice in which you like to have all the parts or steps working the same way each time.
Just make it a practice to know intimately what your printer's health is and exactly in what condition it is before you do something that you may need to repeat. Because you are making film - and this film in turn will become a negative in which you decide exposure and development - you want to avoid using faulty film to make a basis for a system. Perfect everything! Repeatability!!! :)!