If the glide slope is too shallow and the plane is slowing too much during landing and assuming proper CG, it is likely a product of the up trim needed for level powered flight. Spell that condition D-A-N-G-E-R because unless you apply some down elevator when landing, the plane will want to slow too much with a too shallow of glide slope.

There are two ways to deal with that condition... first you could mix some elevator down trim at low throttle and second is to perform the incidence change on the wing, giving it a slight bit more positive so as to reduce the up elevator trim needed for powered flight.