Never tried, but you should be ok. Given the open pattern i would choose a 1.30mm offer for a firmer feel on groundstrokes. But that's me, you should be ok with the 1.25mm too.
I use the YouTek version of Ext Pro which I think is a little more powerful than the MicroGel version. For me Cyclone 18g works the best. I hit with moderate to heavy topspin, and spin and control wise Cyclone works very well. Close 2nd and 3rd are Black5Edge (not as much spin but more feel and comfort) and Big Hitter Silver Rough (a little more power than I like.)
I currently hit with the Head Youtek Prestige Pro and the Microgel Prestige Pro and use tour bite 17g (1.25) all the way through the racquet at 50lbs. I have tried SPPP and the tornado along with Pro Hurricane tour, RPM blast, black code, BB ALU rough, and Luxilon Savage. Tour bite is the best string hands down and the cost of the string makes it even more appeasing. You should try whether in a hybrid or full bed because it will change the way you feel about tennis strings forever.