Any back pressure at final approach speed was unacceptable to me when I started test flying my Series 5 many years ago. With 1/2 flap and a over the fence speed of 55 MPH (solo) back pressure was required, which I decided I would have to fix. Mind you I have the Continental IO-240 up front which is a 250 lb engine so this was part of the problem, always bumping up to the forward CG limit in solo conditions. Adding a tool kit to the aft baggage compartment helped and with the addition of the trim assist kit when it came out solved the problem. Now I can do hands off like Dorsal says at my final app. speed. So I would suggest rechecking your Wt & bal. and try some different weights in the aft part of the baggage compartment to see if it helps your problem. If it does, then maybe consider moving some required equipment elsewhere aft to aid the problem. As an example with the IO-240 the battery must be in the empennage and has to be a heavy one not one of the new lightweight units, my holley fuel pump is behind the header, heavy 3 leaf tail spring in other words anything I could put aft I did. good luck Bruce N199CL