Yeah, definitely not 90%, that's too much. Even when using a dome there should be some air holes to allow for some venting. Too much humidity will rot the clones, or at least make them weak so they need the dome to survive, and then they're harder to harden off.I have a little 2x4 that i veg seedlings in, so keeping the humidity up shouldn’t be too difficult, what humidity is good for a fresh clone in soil
In the spring, summer and fall I don't use a dome at all, but in the dryness of winter I have found I do need one.
Keep in mind plants produce three different types of roots depending on their environment; soil, water and air. So matching your rooting process to your grow style makes to easier to transition them.
So @Absorber 's water based cloning system will work best for transitioning to hydro or coco where the medium is wet all the time. I never had much success with water based cloning systems and the ones that did root had a hard time transitioning to my soil based system, but depending on the initial root system established there are growers that have no issues at all. Very individual.
Most definitely, but not for the reason you stated. Once you find a process that works for you you'll get a very high success rate.My guess you do a few more than whats needed….to ensure success ??
What I have found is that every batch of clones I've ever done has had one or two clones that are substantially better rooted than the others, so I go a bit Darwin on them and only select the best of the best to grow on. My worms get the rest.