If a plane is set up correctly it will fly on RAILS at any speed you choose to fly it , not just a given speed or range of speeds
Getting a bit off the CG issuebut related to airframe stabiliy at any speed

If you are carring UP or Down elevator after your first flights -your wing incidence is not on the same axis as the stab or the engine is not on the same axis as the wing and stab
All my incidence are set at zero on the benchwing to stab and engine to wing and stab , per my mentor , who was flying for 30 years prior to me ( the pattern boys use a different set of rules regarding there incidence set ups )
Need to have all surfaces pulling on the same axis
IF you are carring UP elevator after the first few flights lets say 1/8 inchthis is telling if you to jack the back of the wing 1/8 inch ( lifting the back of the wing the same exact amount as the EL is UP )
You will be carring the elevator trim at zero after the next flight
IF you are carring Down elevator lets say 1/8 inch you will need to jack up the front of the wing 1/8 inch for you elevator to trim out level on your next flight
Once you are carring a- level elevator you will not have issues with changes in the planes direction with changes in airspeed
Your engine can not be set to pull up or down and must be set at zero or the engines angle of attack will cause you to climb or desend based on how much power you apply or do not apply
My planes require little or no input at times to fly straight and level , keeping my work load regarding TX inputs to a minimum and making flying much more relaxing
You will find you CG will have a direct effect on your rate of decent on the final approach, and determine how quickly the plane drops out OR how well it will glide in to land in front of your nose ( the best place to land -as it is your best look at what the plane is doing to make your corrections)
The engines idle adjustment will have a direct effect on the final as well-needs to be a high enough RPM to fly the plan to the ground
and should be adjusted for the days wind speed down the runway
Just my two cents on the above