I would think a foward cg would require more "UP" elevator trim to maintain straight and level.

Anytime the control surfaces break into the airflow over or under the stab, it induces drag...drag slows airspeed.

Flying Cessna 172's we always slid our seats to the rearward position and re-trim in order to gain a little more speed.

I'd rather try a location that someone has used with success....If I go at this blind...I'm going to get into trouble....

Just a fact...Murphy LOVES ME!

Larry