In post series A startups, there is already some 'proof' of success (generally in the terms of growth), so salary offerings gets high and stock options get low than a pre-series A startup.
Stock options/grants are tricky because of dilution and preferences. The 2% can mean many things. How much the company plans to raise in the future? Even if it's not planned, circumstances can change overnight, and company may need to raise.
It seems you have a connection with founders, so it probably won't hurt to talk to them about this issues.
In the end, it all comes to how much risk you are taking, and the compensation you are getting for it.