No, that's not a normal C.G. placement for sailplanes, but there are a couple of other factors that could change things.
First, I downloaded the Aspire EP ARF
manual, to see if there were any changes on the electric version, compared to the "TD" (Thermal Duration or glider) model. http://www.hangar-9.com/Products/Def...ProdID=HAN1950
Click on "Tech + Spec", it's a big download, but it specifies the C.G. should be 3-3/4" from the wing leading edge.
I also found this article, a review of the glider version. The pilot doesn't mention the exact C.G. measurement, but does say he set it according to the plans and it flew fine there, needed no adjustment.
So, why is it so far back? My guess is (primarily) because it has a swept wing. The C.G. measurement is taken (usually) at the wing center. But the outboard panels, about 1/3 of the total wing area, are swept back at the leading edge. No forward sweep (taper) of the trailing edge.
This effectively moves the C.G. rearward.
Here's a few wing shape examples of the change of C.G. when the wing is not a simple rectangle;
(Scroll down about 2/3 of the page)
Unfortunately, none of the wing shapes shown have constant-chord centers with swept tips. But this is a common wing shape on sailplanes, particularly when they have polyhedral.
Let's say 35% of each 1/2 span has a constant chord, and we're looking for a 33% C.G.
The tips comprise the other 15% of each 1/2 span, and they are swept at the front only. We measure 33% of both the dihedral break chord and the tip chord. Carry the tip (33%) point inward to the center section.
Now we have two points at the center. The 33% line of the center chord, and behind it, the 33% point of the tip chord.
The front mark is only correct for 70% of the wing. The rest of the wing (the tips) have sweep.
There must be a formula for calculating the area vs C.G., but I believe my sketch will be correct. Measure 30% back from the forward mark or 70% forward of the rear mark (the center section is larger in area than the tips) and you will have a 33% C.G. mark for the entire wing, measured at the center section. My guess is it will fall at about 40% of the center chord.
The model also appears to have a larger-than-normal horizontal stabilizer. This is an old Free Flight "trick" to allow a more rearward C.G., since a larger stab reduces the stalling tendency.
So, based on the info I've been able to find and my (rough) calculations, the 3-3/4" mark measured at the wing center section, could be right.