Many people have had the same issue. The "problem" is that for heavier pulls, the trigger needs to push against a spring and move a tiny amount to achieve the intended pull weight. I had the same feeling with my Jewell, and that was the explanation I got when I called Jewell. The engagement screw can be turned in a little to tune the amount of take up. Check out THE JEWELL TRIGGER MANUAL
for directions on the adjustment.
BUT, after you tune the engagement, you absolutely need to do the safety checks by cocking your rifle, and closing the bolt hard a number of times to make sure it won't fire when the bolt is cycled hard. Decreasing the engagement too much will result in an unsafe rifle.
I had the same issue, and wound up putting a tuned factory trigger on my LR rig, and putting the Jewell on my varmint rifle. The 8oz pull on my varmint rifle is soooo nice.