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Is the barlow one of those types with an unscrewable lens cell? If so try unscrewing the lens cell and screwing it into the bottom of the eyepiece. On my barlow this gives roughly 1.5X. That could give more magnification than the 10mm eyepiece on its own but still allow the mount to handle it.
I own a celestron skyprodigy 130mm telescope and I regularly use a 6mm eyepiece+2X barlow for lunar, planetary and double stars. It is F/5 though so it is only at 216X. With the mount well aligned it can keep a planet in the FOV for an hour but it could go longer - I haven't observed one object for that long yet.
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