my advice with any new fertilizer-
Start with half, if its okay at the next scheduled dosing bump up to full
How would you dilute a balanced 18-18-18 please?
Just use the recommended rate and cut in half with water for liquid.
Take care with dry fertilizers there is probably a strong risk of burning container plants with that.
In containers I have had no problems using the 100% slow release type from Nutricote, it is a special formula used by the nursery industry.