It's not the amount that you've trimmed off, it's the length that's left. It's possible your fired cases ain't stretched that badly. A lot depends on your factory brass, the load, and the chamber dimensions. I'd also suggest an RCBS X-die if your press has the extra space for another die.
When I was using the hand-crank designed trimmers I removed the hand crank handle and threaded enough nuts onto the shaft so that I could fit a socket wrench over the nuts and have a good hold. I added a 1/4" drive universal-joint socket to the crank end and mount a Makita cordless drill on the end with a 6" spring-shaft extension (for ratcheting around objects). The Makita would rest upside down on a couple of pieces of wood so that the driving shaft was the same height as the trimmer's shaft. The Makita would really speed the trimming up a lot.
Another thing you can do is modify the lever end so that it operates by foot-pedal--on the left side is the hand lever that operates the cam that holds the case. I would C-clamp the trimmer to the table at an oblique angle. This would allow me to dangle a rope from the lever handle to the floor without the rope touching the table. Nail a 12-15" piece of 2x4 lumber cross-ways to a short length of 4x4. The length of the 2x4 is dependent upon the size of your foot. The 4x4 should be about 8-9" long for stability. The wooden contraption should resemble a miniature see-saw, but be just about 4" uneven, so it rests on the floor like a ramp. Drill two holes in the 'high' side, the side that's not resting on the floor. Run your length of rope through it and tie it off just long enough so there's no slack in the line. Now use the see-saw like a foot pedal--pushing down with the toe end to operate the cam....
Left foot opens the cam, left hand inserts a new case, right hand operates the drill. Left foot opens the cam, right hand removes the finished case, left hand inserts a new case, RH operates the drill. 600 cases / hour, at a pretty leisurely pace.
I haven't been in the market for a case trimmer in years. I bought a Giraud trimmer and never concerned myself over other possibilities after that. I paid ~ $150 for it about 8 years ago, I think. I dunno if there even still made.
