Tom:

If you are using no-clean flux to solder SOTs (or anything with tall,
non-solderable body that will repel the wave from reaching the pad, such as
tantalum capacitors), dual wave would not work. This is because the first
wave (chip or turbulant wave) will kill the flux, resulting in the poor
solderability at the second wave (lambda wave). The way we do it rather
successfully is to elongate the pad size and solder them with a vibrating
wave (omega wave), which has much lower surface energy to reach any shadowed
pads. Good luck.

Regards
Jauwhei Hong
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