Retirement Savings...Again

I wrote a post a few months ago about retirement savings.  The gist of the post was how much to save for retirement and whether I was on track.  Since then I have read a bunch about retirement savings on various personal finance blogs and various articles, etc about retirement savings. I noted that many of the articles that I read focused on saving a particular percentage of your income for retirement.  Some indicate 10-15% should be saved for retirement.  Dave Ramsey indicates that %15 should be saved for retirement. I saved $9,500 for retirement this year.  That was 11.7% of my gross income income (before my raise) and 15.6% of my net income (again before the raise). When I started saving for retirement I decided to start with approximately 15% of my net and try to work up to 15% of my gross income. 

However, at 35, I only have approximately $20,900 saved for retirement. Over the holiday break I was working on my goals for 2018 and I wondered if I should increase my retirement saving percentage since I have so little saved.  The increase would be short lived (a year or 2) and only to make up for the lack of savings in my 20s. 

Previously, I had convinced myself that I would make up any shortage by simply increasing my retirement contributions each year until I retire.  I still like that plan, but I feel a bit concerned about that lack of savings right now.

What do you think?  Do you think percentages are the appropriate measure for retirement savings?  Should I save more now and not focus on other financial goals? Or should I just be patient and increase my retirement savings each year?