I used to have a WP dd washer with the super surgilator agitator.That was the one with the 5 vanes on the skirt and the tiny lint filter in the agi. barrel.
I found that agitator to have very good consistent rollover action.It also created heaps of suds too!too much sometimes.
Jason,was your last WP a 24" model? Maybe the narrower tub impedes rollover more so than the full sized versions.The machine we had was also a single speed machine,.....had i known at the time that they had changed to dd i would have went with a two speed machine. Anyhow it gave it's all for 15 yrs.and was the longest running machine we have had to date.
PC