Yes, just remember you cannot have full trust even in yourself. I never said you should never trust your tulpa. Just don't take their feelings for absolute truth
you can not agree with them on small things, but they wouldn't tell you they exist if they didn't - that's not... how it works. it's a good confirmation.
Do you think they are set up when you think about them first time? Or when? I think they are not set up at all. We create them all the time, if we notice an inconsistent gap in them, we make things up to fill it.