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M_V-
I wrote down different ratios a while ago when trying to work out what single speed to try. I didn't have that combination but 56/14 would be roughly 66.4 (the same as 48/12). 57/14 would be slightly higher and anyway, you will have tried it by now.
54/11 81.5
52/11 78.5
50/11 75.5
48/11 72.5
46/11 69.4
44/11 66.4
42/11 63.454/12 74.7
52/12 72.0
50/12 69.2
48/12 66.4
46/12 63.7
44/12 60.9
42/12 58.154/13 69.0
52/13 66.4
50/13 63.9 98L S-RF3 main
48/13 61.3
46/13 58.8
44/13 56.2
42/13 53.654/14 64.0
52/14 61.7
50/14 59.3
48/14 56.9
46/14 54.6
44/14 52.2
42/14 49.856/15 62.0
54/15 59.8
52/15 57.6
50/15 55.3
MW
Yes 54-12 would be stock, 17t rear is safe.
I favour a 2 speed 60t 13/14 rear