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Thats not a DRSSTC though, as the primary circuit doesnt ring up. In order to actually be resonant, you need to have a single resonant capacitor (or capacitor bank) in line with the primary, not two strattled to the beidge rails. In the scenario youve described, youve just set your bridge capacitors to limit the current to zero during switching. To actually have resonance, you need to move the resonant cap to be in series with the primary, and either construct an H bridge, or replace the bridge caps with sufficiently large bypass capacitors.
This mode of operation isnt actually using the primary side caps in resonance. What you may be seeing is closer to zero voltage switching, which can have benifits in allowing more power to be pumped through the fets without thermal damage. In ordet to operate in resonant mode, you would need sognificantly larger caps on the bridge and an actual series resonant capacitor in between the bridge and primary, but be warned, without a proper current monitor circuit, you are likely to blow up your bridge on higher duty cycles and on-times. This is a rather dated instructabel, but there is plenty of better info out there for anyone looking.
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