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Hello!
Seems more and more people are finding this site from all over the world, cool.
To your question. I would switch to a systema /guarder polycarbonate piston instead of the titanium one. I have used both titanium and aluminum pistons in the past, and they were nothing but trouble in the long run.
Given the components you are planning on using, eventually something will break. My personal preference is for a piston to go ($15US, easy to replace) than a set of gears ($50US, more time consuming to replace, have to reshim etc). Not to say that a titanium piston will cause your gears to lose teeth or shatter, but it will definitely cause more wear on your gears and in the long run you may have to replace them sooner.
Actually it's a funny thing. I've gone through Guarder, systema, ics, PDI, pistons... and what am I running right now in all three (AKSU, M14, M4) of my rifles? A stock TM piston with a nice guarder piston head attached. For some reason, stock TM pistons seem to last a nice long time, and are cheap and easy to find when I do need a new one.
Your spring should be fine, that's not too hot. As for your battery, 9.6v should be just fine. I am assuming your are perhaps running an ANPEQ battery box or a crane stock etc? You seem to be limiting yourself to low MAH batteries. If there is the option, increasing to a higher MAH battery, say, 2400mah or 3000mah would do wonders for both the ability of the motor to crank the spring, and the amount of shots you get out of the battery.
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