Sometimes, it's just how it is. For example, I'm pretty confident in my growing skills, but some strains I just don't seem to be able to make happy. Like Sweet Seeds. My best yield ever was a Dark Devil by them, and my most beautiful buds were from my Red Poison.
That said, I've had a LOT of problems and lost a lot of seeds from lack of germination to heat issues. Yeah, I know it's not their problem, lots of people are growing amazing seeds by them. It's like a fuck**g Twilight Zone, or something!
Just dropped a few Sweet Seeds seeds tonight, now that I think about it!