Welcome to JUST ANSWER small engines, let me try to help you !! Look at your pto clutch, if it has three self locking nuts and three springs, it can be adjusted to bring the armature closer to the magnet. This makes it easier for the magnetic to pull. The clearance should be about .025in. between the two parts. Here is an adjustable unit. Yours may or may not be adjustable. You never know what kind of pto they put on. Let me know.
Hello found this regarding your clutch,if it’s adjustable it might be worth a try.