Hi Mergann!
I’m the guild leader for Lost Rowsdowers and, while I can tell it will be something of a long shot, I wanted to toss our guild in for consideration 
As the linked post describes, we’re a weekend raiding guild with a focus on Heroic but we also venture into mythic even if it’s not our main ambition (so not quite what you’re looking for on that front)
We’re definitely LGBTQ inclusive (half of my officers and large part of our raid team is LGBTQ) and we have stern guild policies against any form bigotry.
Real life always comes first, this is just a game after all
If I have at least managed to peak your interest, I would love to have a personal chat with you. You can reach me either over Discord (Nerz#2932) or bnet (Nerzelan#2725).
Regards,
Nherz