Found many airflow issues with system. System is single stage with no bypass and 1 zone calls for 1/4 dampers. (Upstairs) Recommend replacing system as no amount of ductwork modifications can guarantee that the issues will be resolved. Ewc themselves don’t recommend adding bypass to the system. In the future many more issues may arise such as system kicking out on high limit in the heating season and kicking out on low pressure in the cooling season. System may freeze up if nothing is done.