Aww bless your ds1 Jaggy that's so cute 
My DS's were the other way round with scratching. DS1 was always scratching himself and the little scratch mitts never stayed on unless he had sleepsuits with them in the sleeves. I haven't cut DS2's nails at all and I think he's had the odd minor scratch so far. Then again he's now going into 3-6 mths sleepsuits and they don't have the scratch mitt sleeves at that size.
I know that sounds ridiculous - going into 3-6 mths at only 8 weeks but his 0-3 seemed like they were only just long enough so when he was kicking his legs they would be pulling really tight. I don't like to think of him feeling restricted if he stretches out so I figured since I had a drawer full of the next size up he might as well use those. Plus I suspect the fact that they're all hand-me-downs that have been washed and tumble dried often might mean that they aren't true to size anymore anyway.
Oh and DS2 seems to have a red bottom most of the time here too. As you say, it just gets sorted and then starts up again.
We took part in the MN trial for Metanium everyday barrier cream and I just found it did nothing for him at all. In fact every time I started using it within 2 nappy changes he'd have a red bun. Then I'd do a few changes with Sudocrem to get rid of it. Then I'd try it again - red bum. Repeat......
I'm not sure whether it was causing the red bum or just doing nothing to prevent it. I'm going to see if we can try a few changes with no cream at all and see if it goes red then? So far Sudocrem seems to be dealing with ours but I have my Metanium yellow stuff on standby for if it gets worse.
In terms of tips though, can't think of anything a sorry. Only thing I can think of is some nappy free time - good luck!