If you start to struggle on any stages or just get pissed off with the AI keep hitting you with power-ups just go back to the main menu and turn off the power-ups in the settings section
After doing this I was winning every race by 5-10secs =)
EDIT... I was even able to win by a large margin on new tracks I'd not even raced on before without being knocked off the track every 10secs by the AI power-ups
320 GAMES COMPLETED (NOT INC DLC)
124 Retail 54 WP7 125 XboxLIVE 7 WP8 10 W8
Last edited by IEvil IMonkey; 03-15-2013 at 02:52 PM.