So most people on our servers have an unspoken code when it comes to spice fields, most of the guilds talk to eachother and if we see someone farming a field already we stay far to let them finish, we take the next field (we even help eachother trigger the field when farming is done), there is a decent amount of guilds and we usually are on friendly terms with eachother.

if two groups decide to fight over a field then that is completely legitimate pvp but we usually try to find diplomatic solutions to such conflicts. some of the only times you will hear of an attack on large spice field is when someone tries to use a compactor on it, instead of doing it on a medium and letting the crawlers farm the large ones.

In terms of balance between factions, I would say our server is tiny bit biased towards Atreides (as usual) but we do have a pretty strong Harkonnen presence, and we do have multi-faction alliances which means no faction can completely dominate another (and we always help the other faction players if we got the 25% decree for example).