Play him as a big mid.
He's a small / medium forward, in the body of a key position forward, who is trying to play ruck.
So I think the solution is to play him as a HFF / mid who pinch hits in the ruck.
If he stays involved in the play and doesn't have to ruck all the time, I think he will play better.
Taking the pressure off to be the main ruck or a key forward would be worth a go if we want to play him as the back up ruck and leave JD at CHF and Chook at FF. He can also rest on the bench more in that type of role rotating with other mid/forwards.
Now that Myers could go on the long term injury list he could be temporarily promoted and cover the back up ruck role while TBC hopefully gets fit and finds form .