Excessive phosphorus is not a bad thing plants will use only what they need. If you are using a general purpose fertilizer like 5-5-5 or 10-10-10 or 15-15-15 or 20-20-20 stop using it. Don't use anymore fertilizer with high phosphorus for several years.
Too much potting soil in bags will create high ph soil. I use grocery store vinegar to lower my ph. Buy some PH paper test your water if your water is high PH it will make your soil high PH also. If you live there there is lots of rock & sand soil PH is often high. Fill 5 gallon buckets with water then check ph of water with ph paper. Add enough vinegar to get 6 ph water. Use 6 ph water to water your plants. Soil ph will slowly drop with 6 ph water.
Each plant needs a specific fertilizer,
Potatoes need, 5-10-20
Tomatoes need, 5-5-20
Peppers need 5-10-20
Beans do good with 20-5-10
Onions need high nitrogen 46-0-0 until they grow 13 leaves then switch to a different fertilizer 0-20-20
Corn needs both 46-0-0 & 15-15-15 a week before planting seeds, then 46-0-0 when plants are knee high 1 lb per 30 ft row, again when ears have silks.
Ph paper is $1 per pack on Ebay. Dip a ph paper in water, remove shake away excess water, wait 30 seconds then use the color chart to see what ph your water is. Add 1/2 cup vinegar to water stir well then test again. If you learn 1 cup of vinegar lowers 5 gallons of water to 6 ph you don't need to test water each time after that just add 1 cup vinegar to 5 gallons it will be 6 ph. I buy 5% vinegar at the grocery store it is $2 a gallon.
Potatoes & tomatoes do best with 5-10-20 fertilizer. Onions & garlic need high nit