Now I see the logic of it, thanks.
Regarding the original question, there doesn't seem to be any provision for the gyro effects of the fan(s), which must be huge?
On the Classic & NG the troubleshooting for excessive trim test flight gives Flaps up Aileron 3/4 unit & Rudder 1/2 unit in Cruise and is usually less when tested. The troubleshooting section for excessive trim is very comprehensive due to the huge 737 database.