I don't know if you have the flex in your pipes, but another option would be to make a Z out of 90s and you could have any angle you wanted.
Basically, put a 90 on one pipe facing down. Put a 90 on the other pipe facing up, directly under the one facing down. Then put a short piece to tie them together. You'd need to extend your pipes for that to work...
I don't know any plumbing code as it applies to irrigation systems, so i apologize if this isn't allowed...
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