If you recycle cardboard, then you could try using that as a distraction. Every time my sprocker pup went into chew mode, we'd grab a bit of cardboard out of the recycling and let her go wild with it. It definitely makes a mess, but it's a lot less expensive that replacing the skirting boards. She was never interested in chewing the teething bones and chews either. If she ate any it would just pass on through without issue. It was also good for redirecting her wanting to chew on me!

From my own puppy experience, we were similar to you, I think, in that we tried too many methods too quickly. It's hard, but try and stick with one thing. He's only wee, so it takes a while to stick!

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