with soil (FF or OF), I use half strength nutes (I add 50% water to my soilless mixture then readjust ph) every other watering. very unscientific, but it works. If you are really all about soil, you need to test your soil for nutrient levels. kits are pretty cheap at any garden store, though you may need to go online as the season is off.. and, only in flower. I may lightly fertilize once mid veg, but that's about it.. (my veg is always ahead of my flower, so I am not in a rush to get them big in V)

As for soilless... I found Sunshine4 to be a pain in the ass. its great until the last couple weeks of flowering, then the ph goes all over the place and I get crispy leaves. I run nutes at 80% or less of manufacturer recs, and every 3 or 4 waterings use plain water. add 30% perlite to help protect from over-watering symptoms.

Have you tried coco yet? I'm just about to start flowing some in coco for the first time. So far, I am very impressed. there are some little flying bugs that come in the coco, but they seem to go away on their own and have no effect on the plants. It's like all the massive growth of growing in hydrontin /aero/bubble yet your shit isn't dead in hours if something breaks. you can water 4 times a day, or they can go with 3 days without watering. If you fuck up, it's easy to flush. unlike sunshine4, FF, or OF soils.