I agree wholeheartedly on your point about substitutions. Now that we have some real quality on our bench, we need to make the most of it.
Hanging on until your players are buggered is only a good idea when the bench is weak.
Sitaleki Timani should be on very soon after half time.
Pretorius should be playing close to half an hour if he's coming off the bench.
Elsom should be getting 25 minutes and more once he gets some match fitness back.
Our biggest difficulty should be shuffling between Dennis, Palu and Elsom. Dennis is such a key players and we don't want him coming off too early. Moving Dennis to lock for Mumm/Douglas for Elsom to come on should be given real consideration. Sitaleki Timani would be coming on for the other lock. Lopeti Timani comes on for Palu with about 20 minutes to go.
I think when Alcock is back we play without a reserve 7 and our starting and finishing 4-8 looks like this:
Start:
Mumm, Douglas
Dennis, Palu, Alcock
Finish:
Dennis, Timani
Elsom, Timani, Alcock
The other option would be to start Timani and finish with Mumm.