Need help/ Flight dynamics excessive Lift loss in turns

Hello everyone,I hope someone is able to help me.Im currently working on the flight dynamics of a Boeing 737.I happen to be in the lucky position to fly this plane for real to earn my living.So now to the question.Everything is fine with the dynamics, but when I commence a turn with the plane ,the lift loss is way too high,meaning I have to pitch up far too much to keep my altitude.Its not frealistic to fly a visual approach with 7-9 degrees of pitch up,just to keep altitude for example.It seems to be a general problem,regardless of flap position or speed,though its more obvious in low speed regimesI know of course from reality and the days at flight school that a bit of backpressure on the yoke is needed during turns tocompensate for the banked liftvector in a turn.But this is way too much.I noticed this behaviour with several FS-Planes,even with the otherwise excellent PMDG 737 NG.Does anyone know a solution for this?which part of the .cfg File or .air needs to be modified to reduce the loss of lift duringbanked turns?Would be really great if someone could help.Best regards, Corey