Precondition transformer to control order
FME Form
Imagine a transformer connection similar (or let's be honest, exactly like) the ArcGIS model builder "pre-condition" connection. The reason being is to force with 100% surety that certain features will arrive or pass before being sent/started. Ordering the Readers doesn't help when there are memory intensive operations which slow the first swim lane down and the second swimmer still "wins." A simple, "hey, I know you're fast and all just hold on until you receive all features from 'pre-condition' condition would be a quick fix.
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Basically merge the swim lanes in the "new" Custom Feature Holder which will hold until all data arrives, then release all the features in the custom order specified.