Ah, then you need to introduce loss -- a decreasing inductance is a resistance.
To go from 300uH at 10kHz, to slightly more than 30uH at 100kHz, is a parallel resistance around 190 ohms.
The Coilcraft model doesn't have a parallel (R+L) to adjust. It does have a parallel (diffusion, skin effect / eddy current loss) impedance, k2. This is softer than a resistor, so you can't meet both constraints at once.
Try these values:
* Coilcraft Part: Smokey-300
* Frequency Range: 0.001 to 1 MHz
.SUBCKT Smokey-300 1 2
XL 1 2 COILCRAFT_MODEL PARAMS: FMAX=1 R1=1 R2=1 C=0.000001p K1=0.000001 K2=0.27 K3=300
.ENDS
k4 and k5 only work in the original Coilcraft model, not the conversion; they control how inductance changes with frequency, usually by a negligible increment or decrement. k1 controls skin effect, i.e., how DCR rises with frequency.
Actually, nevermind, just crank up the capacitance to a ridiculous value like 1e18. This approximates a short circuit, so that R1 is directly in parallel. Try these values instead:
XL 1 2 COILCRAFT_MODEL PARAMS: FMAX=1 R1=93 R2=0.001 C=1e18 K1=0.000001 K2=1000 K3=300
You can bring k2 back down around 10, and raise R1, to get a softer transition somewhere inbetween.
Tim