ORIGINAL: weskel
What was the final weight of yours, mine weighed out at 6.5 LBS, seams kinda heavy for a 54'' wingspan.
Hah!
My 40" Falcon .25 has an AUW of over 7.4lbs.
It flies BEAUTIFULLY in spite of the relatively heavy wing loading.
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The FX is not only a light engine, but does not produce the power of say a .46 AX.
While more powerful than the FX, it doesn't surprise me that you found the plane a bit of a dog with that engine.
You may want to consider removing the lead, and instead move the battery pack forward, installing it in the cowl. Also moving the engine forward even .5" has a rather dramatic effect on the C.G. if the battery pack alone is not enough to adjust the plane.
The half pound drop in weight may transform the plane... I've had similiar things happen with other planes.