Putting out the assassin bugs with the predatory mites is not a good idea. They are indescriminate hunters. They also tend to fly away. They do a better job on aphids and whiteflies in my experience.
The G. occidentalis usually only works in cooler temps below 90F. Above that their populations crash. They are awesome in a temperature controlled greenhouse.
N. californicus can take the heat but need high levels. This is why they work in corn. Apply them at tasselling and they reproduce on the corn pollen rapidly. They then can suppress spider mites for the rest of the season. Otherwise you are left releasing every 2 weeks for the rest of the season. It works but it's expensive.