<human>: I'm the sole IT person at a small manufacturing company with about 40 office employees spread across three states. I handle all things IT, from day to day calls, to purchasing new equipment, even implementing new ERP software. I would most closely relate my position to a systems administrator, and I have been with my company for four years. 
Our office has been shorthanded the past several months, having high turnover in other departments. That has left me helping out with a variety of other roles, from answering phones to running cost estimates. This has involved working extra hours, which left me feeling undervalued. Last week I expressed these concerns to my immediate supervisor and his boss, who is a VP and owner (family owned company). I felt that we established a good dialog and they were receptive to my concerns. 

Today we did employee reviews and I was given a positive review, a small bonus, and a modest raise. Going into the review I had an idea of what I felt was fair, and the raise was half of that. I expressed that I was a little disappointed, which led to a conversation that ultimately revealed that they had never investigated what the average pay for my position is in our area. 

My manager suggested I come to them with some additional data, the VP seemed slightly annoyed or even offended. Ultimately I discovered that I'm about $10k below the low end, and $22k from the average. 

I passed my findings onto my manager and explained that my feelings were indeed justified, but I'm having problems with how I should handle it from here. I don't want to over play my hand and end up in a spot where I seem difficult or greedy, but I'm also frustrated that there is such a large disparity.

Summarize the given text in a few sentences.
<bot>: Feeling under valued, feelings validated by multiple localized salary reports and job listings, not sure on best way to further the conversation.