New here, figured this would be as good a spot as any to post. Just got the creme de la crème of Craigslist specials, a 750 with no papers that the PO couldn't get to run right for a measley $250. Up to ~¼ throttle the bike runs beautifully, idles smoothly, and throttle is snappy and responsive. However, if I hold the throttle between ¼ and ¾, it splutters and bogs and sometimes just stalls out completely. If I hold it wide open, it'll splutter its way past the dead spot and hit redline. Riding it is like the worst case of turbo lag to ever exist. I have tried adjusting the pilot screws, cleaning the carbs (including the emulsion tubes, which helped ever so slightly), checked float needles (not hard or worn), and putting the needles in every single position. I don't know what's been done in the carbs but it's evident that I'm not the first one in there, the outside of the emulsion tubes are slightly marred and I highly doubt the needles are stock. I've looked at what feels like every single forum and every single site to no avail. TIA, and if this post is in the wrong section or if there's a better place for it just lmk.