Opinions on hybrids between parvi & multifloral

[NYCorchidman]

It is a well known fact that these hybrids, when turned out right, can be the best ever, but it can also be quite frustrating to bloom them.

I have always wanted them, and I did purchase one blooming size Delrosi (among my favorite along with Dollgoldi). It is growing more leaves and roots and I hope I get to see flowers not too far into the future.

Delrosi, Dollgoldi, Harold Koopowitz, Gloria Naugle.

Are these pretty much equally pain in the butt to bloom?
I assume GN might be the toughest because micranthum is what many people have hard time with.

Please indicate whether you have these hybrids involving older (slower to mature, harder to bloom) rothschildianum or "newer" one.

I know that like anything else, it all comes down to basically the luck with individual plants as some older ones are still reliable bloomer while some newer cross can be just about as frustrating if they ever flower at all.

Anyone can confirm that the "cold shock" treatment works for these?

Thanks in advance!