IDR on Tekno is the same 2.5:1
My Monster Max came with a High Torque Rotor and Low Resistance Stator, Eric Anderson marked the box with (10.5 - 10.6 - 10.7), I have no idea what those numbers mean?

That being said, since 24/81 is doing well for me, then I would probably give 23/78 a try... I plan to drop to 22/81 tomorrow and see if that feels any faster, they won't have the timing loop on so it will be just a "feel" but I do expect to race on turf the following week... this week our club is racing on the 1/8 track and they alternate between the 1/10 and 1/8 tracks each week.