If you're broke, put the stock springs back and run F-stock. ESP is a slippery slope and you would need many $1000s to be competitive. Then do as Dave suggests, since he's fast and knows what he's talking about (I should know, he kicked my ass up and down the ProSolo courses at Summer Nats ).
If you're losing to a Boss by 8 seconds, do driver driver driver mod. I love Bosses and sometimes regret not buying one instead of my GT, but they are not THAT much faster. On a 60sec. course, my F-Stock GT was about 3.5sec "raw time" slower than a Boss 302 LS prepped for ESP and driven by a multi-time national champion, and I drove like absolute CRAP (never mind that I'm not in the same league as Jadrice when I drive well). That's with both of us on Hohos, but Dave on Z2s was only a few tenths back raw time. Did I mention I drove like crap?