Peaches and nectarines need 4 to 5 years to get really good fruit. A small peach tree around 5 foot tall should have no more than a half dozen fruits. When thinning your peaches you need start early, when they are about 1 inch diameter. As your tree matures you will get better fruit, proper thinning will be the only way to get good fruit. Water management should come after your tree grows to good size, or it will stunt out, providing small, bland, fruit. I have a few peach and nectarine trees next to our lawn and as long as I keep them well thinned, they provide excellent fruit, usually between 20 to 25 brix, even though the lawn gets watered every day. Neither of these trees gets watered by lawn sprinklers, but their roots must be exploring under the lawn. You can limit your water and get even better fruit, but you don’t need to kill your lawn doing it. If you need some scion wood message me in December, happy to give you some. Evas pride is a wonderfull peach, mine were 18 to 20 brix and this was on a 2 year old tree, planted this spring. Were yours streaked with red and orange flesh?