Your trainer has a flat bottomed wing so your trim will change with speed changes. Your Tiger can be set up so that it will fly at the same trim through most of the envelope. The key is getting the CG in the correct range. Most instructors still teach that a nose heavy airplane is more stable. The problem with that is the airplane will have to carry up trim all the time. This up trim will change with speed. By creeping the CG back you can find a range where this trim change is minimized or in some cases eliminated. A side benifit is that an airplane with correct CG will actually land slower as well.