The only thing corrupting in my deck is
Wraith World and you'll notice through gameplay that you add a lot a of burdens, but most often not enough.
Wraith World is there to tip that scale if needed.
I still think that most of what I suggested would serve you much better in killing the RB than insisting on killing it with
Gollum, DaD in regroup phase. You have very little chance of doing that because there is very little chance of Gollum surviving.
If you really want
Gollum, DaD to be the one to kill the RB in regroup phase, you'd have much more chance with Isengard Orc Swarm with
Library of Orthanc. Here Gollum has a decent chance of survival to regroup phase (you assign most minions to the companion skirmishing Gollum to ensure victory) and then kill the RB.
Library of Orthanc/Isengard Tender/Gollum,
DaD is one nasty combination. Also note that you can add the needed twilight with
Gollum, DaD if there are some burdens.