Joe, I have the M01013 50" mower on my 318. The blades I am using are M76461 Deere blades, which are listed by Deere as "medium lift." By actual measure, the lift wings are 1-1/4 on these blades.
This dimension is "high lift" on blades for several other decks. I have a Husqvarna 48" stamped deck mower, for which the standard blades are "high lift" with the same lift wing dimension and, indeed, perform as a much higher lift than the Deere mower. It is very noisy, raises tons of dust and could double as a leaf blower.
Since the pasture I mow with both these decks is flood-irrigated from a ditch, there are times when I mow places that are quite wet, and the Deere 50" cuts fairly well through them.
There is a pdf file available from Oregon (saw chain), who make Gators and replacements for OEM blades. OREGON_BladesByOEM.pdf Best found through a web search to get directly to the pdf. They do not list blades specifically for the M01013 50", but have blades, both OEM-replacement and Gators that are dimensionally correct for the mower (17-3/16 long, 11/16 mounting hole) for other Deere mowers under different Deere part numbers. I don't see anything with a higher lift.
I'd suggest you try a set of the M76461 blades on your mower. Can't comment on Gators, as I have never used them.