Regardless of the pool I use, the rejects group together usually 2-20. Is there a reason for this and is it usual?

On the new version of diablominer, speeds decrease with hardware errors and the pool reports those speeds. But on the old version it gave much higher speeds and the pool reported those higher speeds. I have tested this. How can this be fixed for the newer version?

(I know i asked this before, but i got no answer specific to grouped rejects and there is a 25%+ speed difference between versions that is not just on my end, I have experimented with -v and -w to no major difference in the long run)