It certainly looks nice! What you're describing sounds like a stall condition rather than a thrustline issue. It could be the CG is too far back, or the wings have some wash-in (or both). If you're flying it with the drop tanks and landing gear in place then first I would remove those. They're probably causing excess drag and adding weight. Once you get it flying you can try putting them back on. Next if they gave you a CG, then disregard it, it may be wrong (all too common in R/C). Use this CG calculator instead:
Set your CG at the calculated mark or a little ahead of it. Next check the wings and make sure they don't have any wash-in. It would be preferable to have a bit of washout, or alternatively you can put a little reflex ("up" trim) into the ailerons.