Have to say i agree withe earlier post T, the scoop on the bonnet is allowing air in and equalising the pressure in the engine bay against the air coming in the front of the bonnet, the result is a stagnant area in the engine leading to lack of flow through the rad, had this issue on one of our race cars some years ago, some good size vent holes on the sides of the bonnets should help or possibly block off some of the front of the scoop? We solved the problem by fitting a flat floor, rear diffuser and sone fancy ducting, might not be appropriate for you though :-)
Nice upgrade on the tyres BTW, you must be getting expert at "whipping your spring out"!!!
Mac
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