I agree that the SS6105 frets look small. So much so I got out my calipers and measured them. They really are not that small, they just appear like it, to me anyways. After playing on them, I really like them the most. I got SS6100's on a bass neck and they are truly giant. Works fine for me there because I don't try to strangle the bass neck like I do the guitar neck. But I do understand what you are going through, with SS1505's I thought 'No way this can't be correct' at first. And I measured it, and Son of a Gun, it is what it is supposed to be. I put one of my other guitars with large frets next to it, and from the side it doesn't look as small. Maybe the stainless is shinier and it fools the eyes.
Patrick