Yeah, this HR guy scares me a little, too. I know the dollar amount limits, my inquiry was about % of paycheck limits. To my knowledge, this is left to the company/retirement plan. I went from mega corp to a smallish dotcom. Previously, I spread my contributions out throughout the year to max out the company match. Well, I'm missing out on 3 months of matching while I'm in my probation period. It looks like I'll need to contribute around 35% for the last 2 months to be able to max out this year.
I didn't mention my age, but I'm 28, with no house, and I'm at ~125k net worth. My priority has always been maxing out retirement accounts. I'm just getting to the point where I'll have enough left over to start growing my after-tax accounts by more and more, assuming continued raises and all that jazz.