Hi, so my 89 XT600 has developed yet another issue. While bringing her back from her winter sleep, I cleaned the carbs, changed the oil and put on new handle bars. Oil used: fully synthetic, 1st time going to full. I had the throttle tube all apart (1st time in there), and had a few problems putting the cables back in the right order, but eventually got it all working. So here's what's up. The bike runs, but when I give it gas, it won't accelerate like it used to before I had it all apart. It seems to be slipping (in all gears), but when I "ease up" on the throttle and baby the throttle, it accelerates better than if I give it "normal" gas. When I give it "normal to me" gas, it accelerates slowly and just makes noise like I was giving it gas in neutral = more noise & hardly any acceleration. I've tried re-adjusting the throttle cables that go to the carbs, but that didn't really do anything. Could it be wrongly routed throttle cables in the throttle tube? The play in throttle seems fine and throttle twists like it should, so maybe it's because I put in fully-synthetic & loosened things up?? I also changed the rear tire, and though for a minute that it might be wrongly adjusted chain, but chain tension seems fine. Slipping clutch?? I've never ran into this before, and I'm hoping that it's throttle cables related, but I'm afraid that I goofed when going to fully-synthetic and did some damage to the clutch? The bike has 11k miles, accelerated fine until I did the oil change & messed around w/ the throttle cables. Any ideas? Thank you for any pointers.

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89 and 88 XT600.