Solder Skips and Shorts on Lambda Wave, Omega Upgrade?

I just got back from a visit to our PCBA manufacturer. We have good flowthrough on the PTH, but solder skips and bridges on the SMT SO IC's. We have correct orientation and robber pads, but the results are still the same. I noticed the wave shape is very flat, and think the flat lambda wave and solder surface tension are to blame.

Is it possible to upgrade to an omega wave, or perhaps a dual wave? Would this be recommended as we have about 1,500 PTHs and about 48 SO IC's to solder?

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