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Did you find them a bit dead?
TBH, the only bike I've ever really understood that concept on is my 853 Sunday-best bike. On a day-to-day bike, which is primarily for commuting, I've generally found that there are so many other things contributing to the "ride" that one tyre being a bit more supple being another is not that big a deal.
That being said, I've only ever ridden standard Marathons, not the Marathon Plus. In more than 10 years of commuting I've had 2 punctures, both from things that would have stood a fair chance of going through a car tyre.
Did you find them a bit dead?
Having a look on CRC and there seem to be quite a few options like these:
schwalbe-hurricane (obvs massive) or these: Schwalbe g one
TBH I'm getting way ahead of myself. First is to shortlist a few bikes to see what gets vetoed.
EDIT: pretty sure these are the tyres my OH used to have
https://www.chainreactioncycles.com/continental-travel-contact-wire-road-tyre/rp-prod83063
Continental Travel Contact Wire Road Tyre
pretty much slick in the middle with grip on the edges.