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These all sound like solid indications of a line pressure issue. From the slipping from take off, the jerkiness and to the inability to get it to go into over drive unless it is revved very high, these are all typical behavior of the line pressure being low. Worn friction material will cause the same behavior (as it requires more pressure than normal to clamp), however it is rare to affect multiple gears whereas line pressure more often does affect multiple gears.
Since you have already replaced the external filter and changed the fluid, the next stop from here is going to be getting line pressures tested to see what is going on internally.
If you have low pressure across the board then you would know you have a pump issue or clogged internal filter (There are two filters on this transmission, only one is self-serviceable though. If you had good supply pressure but weak pressure on all sub circuits we would suspect a valve body/regulator valve issue. If only certain circuits were low we would suspect a valve body or o-ring issue inside the transmission.
If all pressures are top notch, then we would only expect worn friction materials. Again this is unlikely with the condition affecting multiple gears, however if the lines pressures check out OK and you are still getting these slip-type symptoms that would be the only expectation.