I think you should stick to the Western Conference for this, I might actually jump on that strategy for two reasons:
1. The lines will tend to be smaller I think in most cases because there's so many closely matched series (series prices are evidence).
2. These teams are all very good home teams and questionable road teams. I havent done any official research on it BUT it seems that over the last 3 or 4 weeks (at least), in matchups between two West playoff teams ven including Phoenix, the home team had a lot of sizable victories. Even when its the two same teams playing twice in the span of a few days (NO-Dallas comes to mind), the home team won by DD in each game and covered ATS I think.