I've tried a whole lot of disposable ones over the years and have ended up using the 'Rhubarb and Custard' ones - Howard Leight Laser Lite - as my plug of choice. They fit easily when new and with a bit of care I can get about half a dozen refits out of them. Ear wax has never been a problem but I guess that's down to peculiarities specific to my ears rather than any functional of the plug.
Disposables are awkward though. You've only to forget to fit them during the winter - when you have to spend 10 mins disrobing to get to your ears, to curse the day they were invented. Plus, they tend to be very effective - to the point where you can't hear anything, and that doesn't work well in garages or when people try to speak to you. On a small bike though - like my B120 - they're worth about 10mph as you can't hear the mechanical mayhem going on beneath you.
I'd give custom fit another go if they weren't so expensive but ideally I'd prefer some kind of electronic version - noise cancelling tech or something - that could be adjusted (by app maybe) for different circumstances. I'm not aware such a thing exists though. The only other alternative is a very quiet bike. My GoldWing + aftermarket screen does a very good job of keeping noise levels down - I can still listen to the radio at 70mph, but that's one size that may not fit all.