I use the same soil. I personally wouldnt mix perlite into FFOF. I used to do that and everything turned out good but i was told that their mix is specially blended to give the plant all it needs. Basically the soil is as close to perfect as can be just the way it is. I have been using it awhile now with great results. With the FFOF you shouldn't even have to add nutes til about 3 weeks into flower. Just 6.5ish phd water while in veg as long as you transplant around every 6 weeks or so. The light warrior is great for seedlings IMO. The thing with it is there isnt alot of food in it for the little ones so they tend to turn a lighter green before its time to transplant. I use around 6-6.2ish water while they are in the Light Warrior since its more peat based. Thats just the way i do it. The light warrior will tend to repell water as you probably already know so its best to water slow. If you mix up the soil in the bag before you use it, it tends to soak a little better. I hope this helps you a little.