Well, the decision has been made. Last week I asked my mom to think along with me. She's been to WDW so knows what she's talking about, understands my WDW-love and of course my health. Dad just called, asking about the price difference. Long story short, they've made a decision. I will be going for 3 weeks, split stay CBR and YC/BC. The price difference from 3 weeks CBR is a gift from my parents and grandfather that died about a year ago. (Also loved to travel, and sweethart app. gave parents some money and told them to use it towards me when any of my travels would need some $-input)
Still can't really believe it yet, but wow have things worked out here!

So basically, any tips and tricks about what to do and not do with a split stay are welcome.