The autopots are good, mostly user error so far on my part but you are right, organic nutes in the reservoir have not worked for people as there is too much sediment and colloidal material for the small water lines.
I do know some growers on another grow forum who use rich organic soil in the pots and just water in the reservoirs. They have had good results and may occasionally top dress with something midway through. Can always turn taps off and top feed a tea or some such thing.
Otherwise, these can go upwards of a week to ten days (2 vegging plants on one 12 gallon reservoir) with low to no maintenance and that is why I bought them. The autopot folks have a UK and a USA website. @Blasting @Niala