Are you feeling any sort of discomfort after a long period of time on the bike? If not, I wouldn't change the length just because you feel like you need to stretch more.

Deda Elementi have a longer reach and deeper drop.

Saddle height is an important factor for comfort on the bike.

I have been running my saddle too high for a long time, and now lowered, I've got much more power when I'm on the flat.

I use a combination of formulas and rules to calculate my saddle height.

My average inseam length is about 87.5cm, my saddle hight is about 78cm from centre of crank to top of saddle.

This is the number I came up with the Lemond formula (inseam x .833) and the 109% rule. (109% x inseam - crank length).

You could be running it at the wrong height.