Do you have the data to backtest your VONG?

No I don't.

This was really a gut decision. Large cap & growth & large cap growth have been very profitable asset classes for a long time. That in itself deserves a close look. I remember a Ken Fisher column in Forbes about 30 years ago which said that large cap was the best class.

I figured that since the top 10 holdings are the bulk of the total weighting that they drive the return and the other 350+ stocks are also-rans and are responsible for very little of the returns.
The #11 company is only 1.7% weight.

(Heh, when I was looking just now one of the sidebar links was "4 months ago - VONG: Not The Time To Bet On Growth - Seeking Alpha". VONG is up 14.62% in that time.)

The first time I bought the top 10 in the same relative weighing. That was a PITA.

And Jim keeps saying that equal weight is better. So the next time I just went equal weight.

I use a similar screen using NAS100 but I would like to expand the universe.

It's the same top 10 holdings. Russell 1000, VONG, S&P500, QQQ ...... all have about the same top 10 stocks.