Money4nothing,
Not trying to shutdown your idea, but shorting now is a perfect example of a high-risk, low probability trade. If you call a top and you are correct, then you will have a nice profit. Unfortunately momentum is going against you and being short after such strong days is not the wisest thing.
Also, you continue to mention the vix and that it suggests that the market is overbought. Well there are thousands of variables influencing the market, so what does it matter what the Vix, one indicator says. Furthermore, what does in mean that a market is overbought for intraday or swing traders? Market can continue to be overbought tomorrow, this week, this month, or rest of the year (please refer to tech boom).
BTW, a low vix points to a bullish market. The VIX and S&P 500 move inversely... what do you mean by low vix? Lower implied volatility is bullish.
You're pushing the buttons and making the trades and I don't want to discourage you... Your P/L on this trade will prove one of us right. My opinion is that you are taking on a high-risk, low probability trade.