I agree with the sentiments expressed already. Just for comparison, I'll share my companies ESPP.
They offer quarterly enrollment periods where you can elect to withhold 10% of your salary for ESPP. At the end of the quarter shares are purchased for you at a 15% discount to market.
So if you sell immediately after each period you basically get a 1.5% raise. Of course you need to pay ordinary income tax on that because it is a disqualifying disposition.
However, if you would like to only pay LTCG tax then you need to wait for the
qualifying disposition . That means you'd need to wait 2 years from the grant date and 1 year from the purchase date (whichever is longer).
My strategy so far (~2 years) has been to hold. I work at a pretty large company and am not to worried about large fluctuations. Plus, there a 2.5% dividend so it's doing better than my savings account. The stock has risen significantly with the entire market and now I find myself questioning whether to let it go longer, and keep avoiding the extra tax, or to sell and invest in less risky index funds.
Your plan appears to be different from a tax perspective. In that case, I agree it's probably best from a risk diversification standpoint to sell and invest the money elsewhere.