I took me about 1 months to find the perfect group and here is what I found, I followed a simple rule of thumb and got it done eventually
Rule : If you join a DF or PF party, if that party cannot go post heart phase on the 2 first attempts, this party will NOT clear it, so don't lose your timea and find or form another group.
I also wrote down the name of every member I found competent and skillfull (in PF because same server) and made them my friend, so every time I wanted to try Tex, i would ask em if they would do it with me so I can trust these people, at one time, i Had like 10 names
GL