For that problem where the tasks are becoming detached from the customers, hopefully you have a field such as a customer number and you can set the key field of your new connected table to be the customer number.
That way when the record IDs get jerked around during the Sync process the tasks will still be connected to the customer number, which has not changed.
I suppose if you were desperate you could set the key feel to be the customer name but of course if you then change the customer name spelling for some reason in the original table then all of thetasks in the Connected application will become orphans for that customer
