I've seen on some topics posts talk of "doctoring" cake mixes when making tiered cakes from box mixes . What is that and how can I do that to help strengthen my cakes? Thanks !

Thread with all the extended/enhanced/doctored cake mix recipes:
(Also has a link to thread which covers just about anything that CAN be added to a cake mix.)

http://cakecentral.com/cake-decorating-ftopicp-6205286.html#6205286

HTH