I think it is time to try something different. Dufty did score a really great try, there is no denying it however, he did struggle under the high ball and in defence; that's where he was at late last year and that is the main reason Widdop was selected ahead of him at fullback.
It's time to put Dufty on the wing. Teach him to go to ground when taking a high ball near his line and to make his way infield when carrying the ball into the defence. He is fast and allusive just as Slippery Morris used to be and I am sure could score a multitude of tries if selected on the left or right wing.
If Mary wants to persist with Aitken at 3 (I don't believe he should) then select Lomax at fullback and see how he goes. It is no good just doing the same old same old because the same errors continue to occur and we just don't have the backline talent to keep backing up those errors. So for the Eels game, I'd suggest the following 17:
1. Lomax
2. Dufty
3. Aitken - only because I have to
4. Lafai
5. Pearson
6. Norman
7. Hunt - Field if Hunt is injured
8. Vaughan
9. McInnes
10. Kerr
11. Sims
12. Frizell
13. Lawrie
14. Robson - McInnes needs a break towards the end of each half
15. Graham
16. Host
17. Leilua