I did 2 and 1 with my 1250, but am pretty sure 2 and 2 is fine. Mine originally only had 1 and 1 and they were pulled by the couplers really bad originally. The extra disc took up the extra space perfectly on one end, but the end with just the one disc still had some pull on it, wishing I had put two there also. I was also told but didn't do this, that NF couplers have a smaller center hole than the WF and QL's and would add more strength and longevity to drive line. I hope someone else speaks up about this. 
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DWayne
1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck
10" moldboard plow
2016 XT1 42" deck 18HP
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