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Shortening the pipe in the sump helps purge the air, but it usually isn’t a issue unless it’s submerged more then 1”. U can also lower the syphon standpipe or raise the open channel standpipe. By doing eighther or both it will help the syphon purge the air. How u have the standpipes the water in the overflow isn’t building up enough to purge the air because the open channel takes all of the water before it gets to that point.
From the looks of it the two standpipes are at the same hieght. In a exterior box like yours it’s a good idea to have the open channel 1/2” to 3/4” higher then the syphon.
I use the standpipe on my syphon, but if u don’t want to mess with it it is fine running how u have it now without the standpipe. Put a strainer on it & its good to go.
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