Fertilizer routine? 20-20-20 and 15-5-30 and Epsom salt?

I need some help on my fertilizer routine. I have 20-20-20 and 15-5-30 and Epsom salt so I’ll want to use it if possible because I purchased them in high quantities and don’t want it to go to waste. I’m thinking:

20-20-20 once or twice a month?
First month going outside (may): 1 tbsp/ gallon

Then in June when flowers started to form until harvest

15-5-30 twice a month?
Dose: 1 tsp / gallon

Epsom salt once a month?
Dose: 1.5 tbsp liquid (equivalent of 25g)/ gallon.