I'd say switch to FI, then you'd only have one filter to clean...
Ayup, get the K&N cleaner and oil... Then wash, dry, oil, repeat.
Also, smear a little grease on the top and bottom of those filters so they get good seal on the filter base and lid.
Those filters look clean, BTW. K&N's can get pretty dirty and still flow like mad. You could also get some pre-outer filters to help that much more. The Buggy guys use them for sand use.
Tom