Some random thoughts:
1) Cold compresses
2) Remember that being preservative-free is not a virtue, it's just an absence of a vice. Experiment till you get artificial tears that are also effective i.e. the ones that last longer than others and actually make your eyes feel better for a considerable time.
3) Pay close attention to how your eyes respond to ANY drops. There is always the possibility of a sensitivity or allergy that may increase redness. These things can also develop over time.
4) For some patients, using only serum drops can be helpful.
5) If there is any history of more redness with Rx drops, consider getting preservative free Rx drops compounded.
6) Look around for any possible environmental culprits even if you believe you do not 'have allergies'. Laundry soap, hairspray, face products, makeup, mold in the house, all kinds of things can prey on dry vulnerable eyes making them redder.
The Dry Eye Zone