7 months ago I landed a job as a web developer for a specific technology, it payed a little bit under the market average for the position.
When I started in the new place I noticed the methodologies and technologies they were using were quite outdated and the company would greatly benefit from an improvement.
After a few meetings I managed to convince my boss of that. From then on I've been both mentoring the team on methodologies and technologies as well as doing what I was initially hired for (developing/maintaining a company product).
At one point I talked to my manager to explain how I provided a lot more value than what was expected from me and I asked for a raise. He agreed with me that I was doing a great job and told me he was happy to go further with it.
He is now offering me a little less than what I asked for and demanding that I should do some extra work to earn the raise. This work is non tech related, but rather management chores like review peer timesheets and whatnot.
I don't mind doing these chores, I just feel that in this scenario I should ask for more than what I initially asked, since this chores weren't on the initial equation. What should I do?