Last night was the first time I ran my custom/diy tubulars on some major climbs and I’m happy to say that it has survived the torture.  Some of the steepest sections allowed some of the spokes to POP into place but the post ride check showed the wheel to still be true. The rims being Deeper/lighter/tubular DID make the ride a bit nicer.  I wouldn’t say it was a big leap in feel but I do notice the ride quality being better.