Dilute 1:200, prewash 5 minutes, leave the film in for 90 minutes without agitation. If you feel the need to change anything, remember that it takes a lot more time to make a very small difference.
But FX-2 is much better for stand development...
1) 4-5 min. presoak
2) 1:100 dilution 68F
3) I use J&C dev tube, so I agitate lightly the first 30 seconds by rolling the tube in water bath.
4) Stand dev for about 40- 45 minutes with a couple of light agitations (10 sec)during the first 10-15 minutes. I've even left it in for more than an hour without much difference (I suppose the developer exhausts after a bit).
5) I use no acid bath, only water (I've been burned by my stop before with Efke)
6) Handle with care...I tend to scratch my sheets of Efke more than any other emulsion.