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Router tooling breaks for a variety of reasons. You can push even small tools pretty hard if the conditions are right, but even a 15% increase in feed rate would not have made up for the cost of breaking, and the benefit would have been negligible. The most common reason for a tool to fail is chatter, either in the work or the tool spindle. If either moves/vibrates/chatters, you are really pounding the tool and spindle to death. Some common causes for chatter are: poor work holding, worn collets, spindle runout (bent spindle, worn bearings, cheap router, etc) and bent tooling (solid carbide doesn't "bend"). Overfeeding the tool will lead to bogging down of the router, and probably a severe chatter just before the router stalls, and/or the bit breaks. Using a larger router will help, as the additional mass will help cut down on chatter. Try a Porter Cable router, and try both common sizes. The 1-1/2 hp is pretty easy to handle, and is a fine hand tool. The larger 3 hp unit will add mass and power, and maybe a variable speed. Always remember to thoroughly clean the tools shank, the collet, and the spindle every time you change tools. Any junk left behind may prevent the tool from seating properly, and it will not run "true", adding to the chatter/breakage problem. Unless you are noticing a lack of power, you should look at the tool and work holding factors as the primary issues, and that may mean that your DeWalt is no longer rigid enough for the job. I have a lot of respect for some of DeWalt tools, but I do not know anything about your particular router. I do know that Porter Cable makes a good quality hand router that is very popular among cabinet makers.
Have you considered outsourcing your drawer parts? There are manufacturers that produce English dovetails and ship a prefinished drawer in a couple of days. Buying doors and drawer parts out ensures a level of consistent quality and cost. Then you just assemble and install. These dovetails are cut on stable, stationary machines The router is not the problem. We use a Porter Cable 690, 1-1/2hp router with an Omni jig and a 1/2" dovetail bit (1/2"shank) with excellent results on 5/8" soft maple drawers. We have never broken a bit with this setup. The 1/4" shank bits broke frequently. You need to use a 5/8" guide on your router (for the 1/2" shank), and a template with 5/8" spacing. No matter what router you use, the 1/4" bit will all ways fail because of the constant use generating excessive heat. It's probably okay for homeowner use but not for production.
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