I have a 2001 Honda CR250R with a pro circuit platinum pipe, jetting is 400 main jet with the stock needle and a 30 pilot jet A/F screw is 2 turns out and clip position is one above the middle position. i am at 2400 feet elevation and i am running a 40:1 fully synthetic ratio. my plug is wet and gas/oily. bottom end is weak mid is great and not much top end. the bike used to run great when i bought it with the gas that was in it but now i changed my oil ratio it runs sluggish on bottom but before it would rip bottom and mid just like i wanted. any specific jetting issues i should fix? im thinking main needs to come down a size?