Pulling 50' heavy harrows with a 305 versatile?

We are considering trading our 895 versatile on a big fwa it's main job is pulling heavy Brandt heavy harrows. The 895 is 310 hp and has its hands full pulling 50' at 8 mph. Could we expect the 305 or 335 fwa tractor to replace it? Mainly worried about slip in wet conditions. It would also pull the grain cart in the fall. Would also put a loader on it.