TL-2843B boost converter slope compensation

I have a boost converter circuit that operates from 11.5 - 13V input, and outputs 14.5 - 18V, using a external sensor to modify the output voltage. The output drives an automotive ignition system, so the output current ramps from 0 to a maximum of about 12A over a 1-3 ms period, with a rep rate of up to 500 Hz (depending upon engine type, coil used, etc.). The circuit I have designed, using a TL-2843B, seems to work reasonably well, but I have noticed what I am assuming is sub-harmonic oscillation, especially at lower loads, and it seems that I may need slope compensation. I'm not a power supply engineer, so this question may sound dumb, but - do I NEED to have slope compensation? In my application, there is obviously some ripple on the output voltage because of the subharmonic operation, but it does not seem to materially affect the ignition coil current. Will this harm the components in my power supply? Current peaks are handled adequately by the current sense circuitry, and my semiconductor switch is pretty heavily over-rated for this application, so what would be the downside? I don't have a continuous current requirement, as mentioned above. If slope compensation is necessary, what value should be used in the example circuit shown on page 13 of the TL-2843B data sheet? I used a PN2222A transistor in the slope compensation circuit, and have a1K resistor between the sense resistor and the current sense input on pin 3, I tried values from 470 ohms to 10K ohms fro r1, with very little effect on the subharmonic oscillation, except at high loading. The data sheet does not give any guidelines for the circuit values required.