Trying to translate 1-10x your salary to equity depends on too many factors.
Talking it over in terms of percentage you'll probably get a bigger piece of the pie.
Keep in mind you're buying a lottery ticket with your reduction in salary.
Think about things like your equity vesting quarterly and over what time period.
Also at what point would your salary go back up to market rate.
Usually equity is to compensate early employees for taking less salary initially, extra effort and expertise, and risking that the startup will fail.
There should be a plan to get you back up to market rate when you are profitable or more profitable.