Drop in steps for vinyl liner in ground pool

I have a set of Oasis pool steps in my pool lumi-o.com Overall I am fairly happy with them, the pool was built in 1980 with only ladders for access, these steps were added about 15 years ago and have held up well. The current liner is about 12-13 years old and so far there has been no problem with the steps wearing through the liner. My only complaint is they do sag slightly when I step on them, not so much that they feel like they will collapse, but just enough to give a very slight uneasy feeling. You can see them in my avatar with my dog standing on them, he is a 120 pound Mastiff.
 
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