Just found my notes. TS slide with sights and firing pin but without recoil spring sleeve was 13.8 oz. TSO slide was 14.1 oz due to heavier rear sight. So the weight loss is about 0.8 oz. Makes it lighter than S2 slide.
Yes and yes. Magwell is good for my hand and the shop ships fast. It might take few weeks to overseas. Actually I prefer the brass version over aluminium (http://www.ipscstore.eu/en/cz/1750-cz-brass-magwell-for-cz-75-sp-01-2000000017501.html).