Smoking at idle/revving; normal? (VID)

first time i recorded my RX-8 revving it, noticed some smoke after i let off the throttle, wondering if this is ok/normal. also, some decent flames/fireballs. Runs strong as hell. i redline at least once per drive (8k+), and premix with TCW3 (might switch to idemitsu), always run premium (92 or higher, preferably sunoco 93), and its always had oil changed at 3k with 10w-30 non-synthetic. At idle, on first start-up, it BARELY smokes till it warms up, only when i premix at 8oz/12 gallons. Never smoked before i started premixing that i had noticed.

pics attached of said fireballs as well as oil smoke for reference. and fun:jump:

RX-8 fireballs - YouTube

RX-8 fireballs - YouTube

CLIFF NOTES
RX-8 touring 6MT
130k miles
New duralast coil packs 10k miles ago (lifetime replacement warranty)
New spark plugs 10k miles ago
New spark plug wires 40k miles ago
P0420 Catalyst efficiency below threshold CEL (bad cat)
Catalytic converter NOT gutted
fresh oil/filter (slight overfill) Castrol GTX 10w-30
TCW3 2 stroke (about 4 ounces in 8 gallons of 93 premium)

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