You're giving way too much credit to those ads... and to the various polls. :-)
The PPIC poll should be compared with the last PPIC poll which shows that Simon went up three, Davis down one, for a net Simon gain of four points. If we gain four points a week for the next two weeks, we're at a statistical deadheat.
Don't be discouraged. The CTA tracking is definitely more accurate, the SurveyUSA/PPIC poll "says" it's likely voters, but it's self-identified likely voters as opposed to those taken from the voter rolls.
Go Simon!