Having the CEL come on is not "normal." It indicates a problem.

Your plugs might be fouling because you are buying the wrong plug. The only reason they will foul from too much heat is if they are the wrong heat range for your engine. The OEM plug for B-series VTEC motors is NGK part number PFR6G-13. That's a 6 heat range plug. If you're running a plug with a different heat range, say 5 or something, you're going to foul it.