Yes, I only do it lite (slightly more conservative in service on the ) and need a good train (see: 68A). Take the first timer at 20-22, as soon as it clears (and it will about 1/2 a car away), wrap. You will hit the south end of 155 in the upper 30s and the north end in the lower 40s. Its an adrenaline rush as one WON'T see the 2nd timer clear to green before you past the S, and you have NO VIEW of the associated signal about a carlength into the tube north of 155 until you're about halfway into 155, the best you can see is the light bouncing off the steel dust, with a green hue (meaning the signal cleared). No hue, full service with a halfway decent shot at stopping (I've had to do that when I took the first timer at 25, and I stopped at the entrance to the tube, about a carlength from hitting the signal).
As far as 167, I had a good train after touching the mid 50s so I actually climbed the hill down to 30, which was the first time I've done that too (not drop into the 20s). Usually its down in the mid 20's between 22-25 pending on how good the train is.