2 way: 
[21 inds] [2938 donors] [minor ancestry = 0.25] [#generations = 97.77]
 E[r^2] = 0.181 
 Fst = 0.186 
 Rst = 0.033
 see here for plots of Mu, coancestry curves, Fst, log-likelihood trace
3 way: 
[21 inds] [2938 donors] [minor ancestry = 0.24] [#generations = 86.74]
 E[r^2] = 0.298 
 Fst = 0.077(1:2) | 0.051(1:3) | 0.249(2:3) 
 Rst = 0.007(1:2) | 0.006(1:3) | 0.004(2:3)
 see here for plots of Mu, coancestry curves, Fst, log-likelihood trace