Not having seen you bowl, it is hard to say, but I had almost the same experience as pooh.
I dropped down to 14's for a year due to my wrist hurting. I didn't notice any difference in my average, even though it seemed the very light hits didn't carry quite as good. At the end of the year, my average was within 1 pin of the previous year ( was actually 1 pin HIGHER ).
When my wrist got better, I went back to 15's, but didn't have to. Just felt more comfortable with that weight, but 14's didn't hurt me a bit in the long run.
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Beware the JUGGERNAUT!
"The difference between stupidity and genius is that genius has its limits."
Albert Einstein