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How can I make transactions work in SSIS. I've tried everything

How can I make transactions work in SSIS. I've tried everything

How can I make transactions work in SSIS. I've tried everything

(OP)
Cannot successfully execute an SSIS package with BEGIN TRAN functionality.

I'm at a loss with an SSIS package I inherited. It contains:

1 Script Task
3 Execute SQL tasks
5 Data flow tasks (each contains a number of merges, lookups, data inserts and other transformations)
1 file system task of the package.
All of these are encapsulated in a Foreach loop container. I've been tasked with modifying the package so that if any of the steps within the control/data flow fails, the entire thing is rolled back. Now I've tried two different approaches to accomplish this:

I. Using Distributed Transactions.

I ensured that:

MSDTC was running on target server and executing client (screenshot enclosed)
msdtc.exe was added as an exception to server and client firewall
Inbound and outbound rules were set for both server and client to allow DTC connections.
ForeachLoop Container TrasanctionLevel: Required
All other tasks TransactionLevel: Supported
My OLEDB Connection has RetainSameConnection set to TRUE and I'm using SQL Server Authentication with Save Password checked
When I execute the package, it fails right after the script task (first step). After spending an entire week trying to figure out a workaround, I decided to try SQL Tasks to try to accomplish my goal using 3 Execute SQL Tasks:

BEGIN TRAN before the ForeachLoop Container
COMMIT TRAN after the ForeachLoop Container with a Success Constraint
ROLLBACK TRAN after the ForeachLoop Container with a Failure constraint
In this case, the ForeachLoop container and all other tasks have TransactionLevel property set to Supported. Now here, the problem is that the package executes up to the fourth data flow task and hangs there forever. After logging into SQL Server and verifying the running sessions, I noticed sys.sp_describe_first_result_set;1 as a headblocker session.

Doing some research, I found it could be related to a few TRUNCATE statements in some of my Data flow tasks which could cause a schema lock. I went ahead and changed the ValidateExternalMetaData property to False for all tasks within my data flow and changed my truncate statements to DELETE statements instead. Re-ran package and still hangs in the same spot with the same headblocker. As an alternative, I tried creating a second OLEDB connection to the same database, assigned that new OLEDB Connection to my BEGIN, ROLLBACK and COMMIT SQL tasks with RetainSameConnectionProperty set to TRUE and changed the RetainSameConnectionProperty to FALSE (and tried it with TRUE as well) in the original OLEDB connection (the one used by the data flow tasks). This worked in the sense that the package appeared to execute (It ran and Commit Tran executed fine) and then I ran it again with a forced error to cause it to fail and the Rollback TRAN task executed successfully, however, when I queried the affected tables, the transaction hadn't rolled back, all new records were inserted and old ones were updated (the begin tran was clearly started in a different connection and hence didn't affect the package's workflow). I'm not sure what else to try at this point. Any help would be truly appreciated, I’m about to go nuts with this!

P.S. additionally, all objects have "DelayValidation" set to true on everything and SQL Server version is 2012.

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