Wheel spin in 2nd

ProfessorDave

First I should say that I struggled about whether to post this under "General Discussion". But since it relates to engine/drivetrain, tires, LSD, and the joys of spirited driving, I decided this was the right place.

Recently I've encountered wheel spin in 2nd gear (I have the 6MT) when accelerating from about 20 miles an hour. Yesterday it happened twice in the span of about 3 seconds getting onto a busy on ramp where I had to move quickly to merge. I gave the Z a lot of throttle, but not WOT. The result: wheel spin interrupted by VDC followed by wheel spin interrupted by VDC. Very annoying and somewhat problematic given the urgent merge. It is possible that the road surface contributed to the issue, but it has happened at other times on very smooth, even pavement.

My question is, how might I prevent this (yes, I know I could drive like I was behind the wheel of a Buick and that would do the trick). I'm running stock Yokohama Advents, with almost 7k on them (rears are low but not down to wear bars yet). The temp yesterday was around 60 degrees. I do not have the LSD (Touring package only). My mods are F.I. CBE and K&N drop-ins.

Should I change tires? Get an LSD? Handling mods? Put a sign on the side that says "Student Driver" and accelerate no faster than 0-60 in 20 seconds?

Any advice would be appreciated!

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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT