Since you have chickens... and all male flock might be a bad idea. Apparently a lot of people that post here have issues with male Guineas and chickens.. I only raise Guineas, so I have no experience with both coexisting. (Many of my friends have males and females of both Chickens and Guineas, with minimal issues tho). I don't know if taking Guinea Hens out of the equation will make it better or worse. If you can keep the Guineas separate, then an all male flock would be more low maintenance for you if you just want tick control. I sold several all male flocks (cockerels) last year specifically for tick control. If you keep them cooped/penned for at least 4 weeks before you start letting them free range for short periods at first and consistently herd them back in before dark, (and keep working on training them to go back to the coop at night, building up to longer periods of free range time)... then yes, you should be able to get the males in every night just as easily as a mixed flock. With your predator situation, I do not suggest letting the Guineas (no matter what sex) roost in the trees, training them to come in at night is key to their survival.