You are correct that the RTV exception on the PRIMARY node is pointing to a possible application exclusive lock when the object is created. There is both a global value and a group level override for "Delay for Object Processing" that can be used to delay iCluster replication before processing a new object. It is typically used to prevent iCluster from locking an object for brief replication that could potentially conflict with an application's attempt to allocate. The feature gives priority to the application so that it can function without interruption. Using the feature for the group that is experiencing some conflict may also reduce iCluster suspensions. When an object is suspended, iCluster's feature for automatic reactivation (default value in 10 minutes) will attempt the replication again and clear the suspension if successful. So you can safely add a 10-15 second delay to see if that is enough time to avoid the suspension cycle. The max value for the delay is 1800 seconds. I am unsure why you get 8 messages in the log.
'Stop the replication group Controlled, make the group level change, start the group normally and observe any benefit from the change.'
Additionally, if the objects in this case are indeed temporary and can be identified by a file specification or folder location, you could consider adding an exclusion to avoid an attempt to replicate them at all. When developers design their apps however, they are rarely considering how their use of temp objects might affect replication and adding an exclusion to iCluster may not be possible.
Lastly, be aware that those temporary suspensions should not effect the quality of the backup environment. iCluster, as it has announced in the log, will suspended the unavailable object and attempt to resolve the replication exception automatically. Only the exceptions that failed multiple activation attempts should need any intervention. That said. your effort to review the log and minimize exception occurrence is the correct method to tune each replication group for efficiency.