The 12k Super Stone, is a great stone and capable of much more than most give it credit for. Make sure to lap it and to refresh, with some 320 wet & dry or a diamond plate. Good diamond plates are available for as low as $30.

Good lighted magnification (from $2-15), will make your honing so much easier and allow you to better understand the process and mark your progress. There are good threads on magnification, do buy lighted magnification at least 60x.

It sounds like your edges are chipping while stropping on paste, common with using too much pressure and/or paste that are not pure. A good paste should extend you edge life by a lot. You do have to be careful about pressure with paste.

What paste are you stropping on and is it razor quality?