Do you spray all 3 at the same time? Or alternate one week one, one week another?
I mix all three together. I mix Monterey BT, Monterey Spinosad, and Neem Bliss Neem Oil (or sometimes I sub Azamax) together at full strength in a 5gal bucket.
First I put about a quart of water in the bucket with 6tsp of concentrated Dawn dish soap. Then I add the Neem (or azamax) at rate for 4 gallons. Then I mix well using a mixing attachment on a high speed drill. Then I add the spinosad and BT at recommended rate for 4 gallons. Then I mix with the mixer as I fill the bucket up to 4 gallons from the hose. Then I add 1/4 to 1/2 strength GH Flora nutes, CalMag+, RAW Silica, Easy Weed soluble kelp, and soluble humic fulvic. Then adjust ph using ascorbic acid. Then I apply with electric sprayer, totally soaking all parts of the plant and soil surface.
Before mixing: The neem oil tends to completely or partially solidify. To prepare, I put hot water in a deep dish and submerge the neem container, holding it under water by putting something heavy enough on top to hold it down. I leave it submerged for about 30 minutes. That is usually enough to make it totally liquid. If there are any little chunks in the neem, no matter how much I mix it, the chunks clog the prefilter on my sprayer. It's kind of a pain in the add, but doing the extra prep by heating the neem in hot water is very helpful later on when applying.
I try to hit the plants once per week, but I wait to apply if there is rain in the forecast within a day of application. Sometimes, that will delay application by up to a week.
Apply at sunset. If sunlight hits leaves that are wet with this, they will burn badly.