I have a question about runoff and drainage

I grow with LC'soilless mix #1 ( i use 20%worm casts,10% peatmoss ,70% coco mix with 2 tablespoon dolomite lime for per gal.) , but is it possible to just water without any runoff and just moistening the medium? Or do I have to have 20-30% runoff like in coco and canna nutes?

If I go with coir in LCs mix, would I run into problems without running it off? I have a fear that I will be flushing nutes away if I let it runoff 30% every watering.

thanks.