833 Advice Needed

Please explain/define better what you mean by "sounds as if it's barely in and feels almost like it's slipping", are you saying that it feels like the clutch is slipping? What rear gear ratio are you running? Did you install a new clutch/pressure plate/flywheel? If you used a worn or old unknown condition pressure plate assembly, or if you have a rear main seal leaking oil then yes it is likely slipping, highway gears like 2.72's or 3.23's will make this much more obvious, where as 3.91's or 4.11's etc. tend to hide it a little more. Really need a better explanation of the troubles your having though to really try to help diagnois the problem.