Hi,
A few of us have done some research on this and there is definitely a significant guild handicap. I’m on mobile right now, but I’ll try to find the exact posts and link them a little later.
The short answer is that a guild that finishes all 6 statues gets significantly less PVP points. When I moved from Guild of Gra to a casual guild a few months ago, my average per battle went way up and I was easily able to maintain an average score of over 60. The logic behind this is that I lost all the guild Stat bonuses, but I can’t say whether the calculation is fair or not.
I’ll try to find my exact results later and will link here if I can find them.
A lengthy thread discussing this issue here:
The results of my own experiment as a high level player with no guild bonuses: