You say you don`t need full trim? Then you have to pull the stick back during the approach. I always trim so that the plane flies the approach downwards on its own.
Nevertheless, I don`t think that in the real thing you would need the whole trim range just to keep the plane leveled between 90 - 100 knots.
The first problem is that final is not flown at 90-100 knots, that is much too fast and the pitch moment from the flaps at that speed will be very great. You should be crossing the runway threshold at 75 miles per hour, which is 65 knots IAS. You can pop the flaps at 90 mph (that's mph, not knots) and from that point the speed should quickly decrease to 75 mph IAS. You should be timing this so that from the point you pop the flaps to where you are over the fence only takes about 30 seconds.
Second, this plane is not a tubeliner or even a nice, stable B-17 in which you would fly a long final. It has to be flown all the time, it is inherently unstable and needs constant, small corrections to maintain its attitude. A nice, long approach where you can sip your coffee would cause the engine to overheat. You want to fly a nice, tight pattern and get the plane on the ground. It does not like being flown slowly.
The flaps are only going to be down for maybe 30-40 seconds if you fly a proper approach, maybe less if you are a good pilot. The plane is very easy to land once the flaps are popped down; you turn onto final, pop the flaps, wheel in a handful of nose-up trim (you've already trimmed for the gear being down at this poing), and fly the plane onto the runway. There is not time to set the plane up in a nice, long, stable, perfectly-trimmed final approach. It is a fighter plane and you fly it right to the last minute.
To to put in so much trim authority as to be able to wheel out all stick pressure for those 30 seconds of flight would mean making the trim so powerful that it would be dangerous and/or much too sensitive for the other 99.9 percent of the time you are flying.
I have not flown this plane in months and I was able to hop in it, take off, and do a nice pattern with a nice smooth wheel landing, no bounce or float, with no problems. I have a FFB joystick and the stick forces were minimal and I needed just under 6 degrees of trim. I think your issue is mainly your idea that the plane should be able to be trimmed out for a nice long final with no stick pressure, coupled with the very high approach speed you noted, but it's not that kind of plane. Put in some more stick time and fly it on the numbers and you should have no problems.