Most Hoyt risers allow for 10% weight adjustment from the marked limb weight.
So you would expect limbs marked 40# on a 25" riser to be about 44# on a 21" riser - but - the Korean limbs are rated at full deflex (bolts full out, typically 5 - 6 turns out from bottomed). So you're starting with 44# limbs and adding about 10% or 4.4#, so your scale reading of about 48# is pretty close.
Now, if the weight doesn't bother you, and there's no stacking (and there really shouldn't be), keeping the bolts full in will give you more free horsepower, than the weight increase alone would suggest. That's because you're increasing the pre-load or stress on the limbs.
Whenever possible, I try to tune my rigs with the bolts full in.
Hope that was what you were asking.
“Simple and innocent, however, as it (the bow) appears, and capable as it is of being a trusty friend and ally, a bow is at the same time a watchful enemy, ready to take advantage of the smallest slight.”