If in fact a MF165 is a 50 hp tractor as stated below I wouldn't want anything bigger than an 8' around here. Likely with that size of tractor you aren't doing big farming and I'd much rather have one my tractor would handle fine rather than struggle. In our soil a 50hp tractor would struggle with a 10'. As stated, your disc is running too heavy in the front and that isn't allowing the back gangs to pick up enough soil to fill in the trench. You adjust that with the center link.
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