Instances and Kvalues:

k=2 we ran on 42 total unique instances (22 gdb, 5 ktruss, 5 warren, 5 pratt, 5 howe)
k=4 we ran on 43 total unique instances (5 howe, 23 gdb, 5 ktruss, 5 warren, 5 pratt)
k=8 we ran on 43 total unique instances (5 ktruss, 5 warren, 23 gdb, 5 pratt, 5 howe)

Overall Summary

Comparing heuristic group RR vs MMMR on all k-values, all instances and all runs: