get a sharpening stone better. for home use, a 1000 grit and a 3000-4000 grit would be sufficient. i got a 6000 grit stone for about 50 bucks during a trip to japan, but that was on sale. else that money would probably get me a 3000-4000 grit stone. already had a 1000 grit at home cos my FIL used to be a chef. he gave it to me knowing i cook too.
the sharpener is just not good/fine enuff. not really 'damaging' ur knives. sharpening knives is like sharpening pencils. the pencils gets shorter. fine stones gives sharper edge that last longer and requires less sharpening, and sharp knives cuts effortlessly and lasts longer. in the end ur knives can last a long time. just like ur pencils remained sharp all the time, it last a long time.