Surpassing 15 Star Tyrant Equip

Okay so the superior items stats come from the enhancing that you do on a tyrant items (which has the superior label) enhancing a regular item (the sw items in this case) would be treating it as if it were a normal item, so if star force works as I've seen it it would take all the enhancements that you had from the tyrant enhancements and toss them in the trash, leaving only whatever you used to scroll the tyrant equip with (which only has upto 4 slots so it wouldn't be that great).

Now if we were to put into consideration that star force goes back to the last "protected" star (IE the 10 star 15 star 20star base save) then after you got to the 15th star you'd be safe, however I have not seen this happen yet so I doubt this is the case.