I most certainly agree with the above poster. . the reflector makes a big difference both to amount of reflected light and the size of the "footprint" your bulb will achieve.

I have used a lot of different reflectors over the years from DIY to tubes,disc and coffin box types.

I have settled (at least for now) on the LuminAire6 reflectors.
I prefer active air cooled reflectors as opposed to passive ,like your current one as they can be moved to within only a few inches of your plants.With a scrog system this may not be as important to you as you only need full Lumen output to the top few inches of your plants (anything above your screen).

Here are some specs on these reflectors. . .

For those that need efficient air-cooling, the LumenAire 6 Reflector has 6''integrated air-cool fittings for maximum air movement. The internal reflective surface is made from AlumaBrite, a highly reflective imported aluminum. The socket assembly and 15' lamp cord are built into the reflector. It comes complete with tempered glass and wire hangers. It will accommodate all bulb sizes. It measures 25'' x 12'' x 8''. Comes with a Lifetime Warranty.

As for raising your light to increase your footprint ,again because you are scrog and so not worried about deep penetration I would think that would be the route to go to help with a better yield.