pamike, you are comparing a RD "longbow" relatively small riser and light weight bow to recurve risers with longbow limbs. They have considerable more mass and material to absorb vibration. I have no idea how heavy of an arrow you are shooting from this bow....and yes, it's probably the same arrow you are shooting out of your other bows (apples and oranges).
I shoot all my bows with bow quivers as I feel it is the most practical way to cary hunting arrows. I rarely ever shoot without one, so in the rare event that I do, the bow seems to have more vibration due to the major loss of weight and that I'm used to a heavier bow.
All bows have "shock" some more and some less due to design (yes, even dead in the hand bows have shock, it's just not as noticeable due to the shooters experience). If you are sensitive to shock, the best bet is to shoot a bow heavy enough to bring the shock level in to a non issue situation. Shooting a heavier arrow and tuning brace height will also help.
The differences between one bow and another of the same make may also be due to different woods used and overall mass weight. Heavier denser woods absorb more left over energy. Also, different draw lengths/different draw weights in comparison to different draw lengths will affect shock. For instance, if you choose a bow that is longer than one that gives you optimum performance for your draw(comparing exact same models just different lengths) you will have less hand shock as you won't be loading it with as much energy. The longer it is, the less energy (remember, I mean longer than optimum for your draw.
If I can help Pamike, give me a call. I may have a little more time on my hands now as I have less Buffalo's to make.
BigJim