TIP #1 on the Easy Glider and gliders in general, move the CG back.

Once you have the plane flying well over a period of days start to move the CG back from the stock position. Normally the MFG recommendation is biased toward stability rather than optimum thermaling. This is not a bad thing, but it may reduce the plane's ability to read lift so that you can catch thermals.

How much? Can't say for sure. Over a period of many flights, try to set your battery further back, say 1/4" at a time. Now fly it for a bunch of flights. Are you having problems controlling the plane? If not, that CG good and you don't have to move the batery forward. But you might be able to move it back more.

Do this till the plane becomes hard to fly, then move it back the the previous position.

The goal is to make the nose lighter so that it can be more sensitive to warm rising air currents, lift, so you can see it better. Of course this assumes that you actually plan to thremal the plane.

TIP #2 - Be sure to open air holes

There are two air holes by the motor that are there for cooling. But if you don't open exit holes for the hot air, where is the heat to go? In fact, because hot air expands, you need 2X as much exit hole space as intake.

There are two air vents molded into the fuse, under the wings. Make sure those are WIDE open. If you fly the plane in a climb and glide fashion, they will be adequate. But if you tend to run wtih the motor on all the time they may not be enough. You may need more cooling. If your ESC/BEC get too hot, they can shut down cutting power to your receiver. If your battery gets too hot, it can be damaged.

Make sure you provide cooling air holes.