| Whoa, there's a lot going on here. Let me try to dissect it all.
1. You play hard enough to get blisters. This is probably the reason they are suggesting flats, as they will be smoother on your fingers. However, given enough time, you will gain callouses so you should stop blistering. You'll probably (hopefully) pick up some good new technique habits in that time too that will allow to you exert less energy when playing.
2. You use light strings. This is another potential reason flats were suggested - some flatwound strings tend to feel stiffer, which would kind of help even out your playing. However, it's not universally the case, and the same thing can be achieved with a heavier gauge of roundwounds. Might I suggest a set of Circle K Balanced 112's?
3. You like your tone. Awesome. Most of us like our tones, but spend years trying to get them to be perfect to our ears. What this also tells me is that, unless you're looking for some diversity in tone between your two basses (having a bass w/ flats and another with rounds is a good way to accomplish this), you should just stick to rounds - flats may not do anything for you.
What it all boils down to is that everything is about the experimentation. You will probably spend hundreds of dollars on different strings throughout your career, trying to find the perfect set to pair with each of your basses. So if you're curious to try flats, do it.
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Originally Posted by McThumpenstein  I don't think the wife would buy the "I need to take off this knob and put a whole new bass under it" story. | | 
