This amount of daily rewriting to a CD-RW is tough duty, as rdgrimes has mentioned. I disagree that InCD is more reliable than DirectCD, and perhaps is less so. InCD is certainly less flexible and well developed than DirectCD. Mt. Rainier decreases startup formatting time with CD-RW discs, but has not demonstrated any increase in ability to read damaged discs.
As indicated, your problem is almost certainly a media reliability problem. The problem symptoms are indicative of a lot of damaged sectors on the media. CD-RW discs tend to be of uneven quality, and some may give good service but others have early failure. In general, they have not lived up to their promises of 1,000 - 10,000 rewrites. In my experience, the old 4x CD-RW discs are more reliable than even the 10-12x discs, much less the latest 24x or 32x discs. In my opinion, there is a reason why the latest and fastest CD-RW discs are hard to find. The reason is that the performance and reliability engineering of the discs lags the hyped promises.
If you really want to use rewritable discs, I would try a different high quality brand and retire the ones that are giving problems. Alternatively, reformat the problem discs and use them only for nonessential copying.
If you can live without rewriting, DirectCD can write to regular CD-R discs with much greater reliablity than CD-RW. Formatting of CD-R discs is very fast even without Mt. Rainier and the formatted capacity is much greater than with CD-RW. Rewriting is given up, but CD-R discs are much less expensive than CD-RW.