Palmettos I know. Often grows in layers, 1-2-3-4 plants deep.
In my opinion your tractor is just too light. Plow fouls because tractor/plow combination lacks inertia/weight/power to pull through. My 3,700 pound bare weight 4-WD Kubota L3560 would stall moldboard plowing in your conditions.
I suggest finding someone with a 5,000 pound, 6,000 pound or heavier bare weight, 4-WD tractor to contract plow, then root rake your fields (secondary tillage) with a Field Cultivator. A Field Cultivator will rake 14" deep.
Dirt Dog All Purpose Plow / Field Cultivator Dirt Dog Model APP 66-5 Total Width 66", Working Width 62", Five Tines, Weight 284 Pounds, Paid $835.00 (2010) Field Cultivator: A Three Point Hitch mounted, secondary tillage implement, used to perform operations such as soil aeration...
www.tractorbynet.com
A FEL bucket spade is effective digging out Palmettos but requires at least a 3,700 pound bare weight tractor, preferably with a thick, heavy duty bucket. Even teamed with my Kubota RTV500 utility vehicle + dump trailer, clearing Palmettos is a slow, one-at-a-time process. I burn excavated Palmettos.
I have never seen a heavy, primary tillage Chisel plow in Florida but that does not mean none are here. A primary tillage Chisel Plow behind a 8,000+ pound bare weight Utility category tractor might penetrate 14" in sandy-loam and pull most of that unwanted stuff mostly to the surface.
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