I'm with Raging Water, Howard Hill and John Schulz on this issue. You have to grab onto it. I don't mean to be contrary (though my wife would disagree here), but holding a Hill style bow with a loose grip will most certainly thump you pretty good. That's been my experience anyway. I also agree that you must use a low wrist grip to reduce shock. Howard Hill told John Schulz to "...grab hold of it." Howard knew a thing or two about straight limb bows.
Other things that you can try to reduce the bite a bit include heavy arrows (as others have said, and don't be afraid to go to 12 grains per pound of draw weight. These bows aren't necessarily rocket launchers, but heavy arrows don't seem to noticeably hurt performance at normal hunting range. Another thing that can help is using a skinny, low stretch string. Just make sure you pad the loops well. I like 18 strands in the loops (10 of D97 and 8 of B50 works well). You may be pleasantly surprised the difference a new string can make, especially if the old one is a heavy old dacron string.
One thing that hasn't been mentioned is the size/fit of the grip. If the grip is too big or too small, it will be difficult to grip the bow in a way that will be comfortable to shoot. I have short fingers, even though my palms are fairly wide (think medium glove fingers with a large glove palm...no I can't find gloves that fit for squat).
I recently acquired a Northern Mist Shelton (see my signature for specs). The grip was not over large, but just enough to give me less than optimum grip. So I removed the leather grip wrap and put a thinner one on. It helped but not enough. So that wrap came off, and I moved to the drum sander. I wanted to keep the grip as close to straight as possible, so I only removed about 1/8" of material, making a VERY slight locator grip. So slight, it is difficult to notice. I refinished the area and replaced the grip...again. That 1/8" made a huge difference in the feel, shock, and my accuracy. I didn't make the bow more accurate; it was already more accurate than me, but I made it shoot more accurately with me holding it.
That's kind of a long way of saying, no, you don't have to just grin and bear it.