[cypher]

Nothing to apologise for Sometimes it can be hard to get things just right as each ham is different & they don't all enjoy the same things, from what you say your cage set up sounds ok (if you want to try uploading a photo there's a thread here that shows you how.. How To Embed Photos).
If it wasn't the whimzee dog chews you tried before then I do think it would be worth giving them a go, it's surprising how much most hams love them!
A lot of tunnels sold for hams are too small for Syrians, you need to look at rat sized toys & tubes really, I can't remember which ones other people use as I don't keep Syrians, but maybe someone else will have more suggestions.
If he really likes chewing on wood some of the hazel or willow sticks you can buy in pet shops might work for him too.