PadawanOfTheGMAT
Thanks. It's true, that "I developed... I conducted" sounds a bit overkill and selfish.
It's not so much about sounding selfish as it is focusing the reader's attention. I'm no resume expert, so take this with a grain of salt. You start each point with an action verb because we already know you are the one doing the verbs, this is
your resume after all.
You don't ever want the reader to notice patterns, like every paragraph starting with "I" or repetitious phrases. Your resume should be like a movie trailer, it hits all the high points and leaves the reader impressed and excited to learn more. Kind of a cliche, but a good way to weed out wishy-washy statements. I would remove transitions to shorten each section, and don't worry about proper sentence composition, the subject of many of these sentences is you, and there's no need to point that out.
I do have a sort of mission statement at the top of my resume. This highlights a lot of big picture characteristics that I don't have a chance to explicitly list anywhere else. It also gives you a chance to start the reader off with your brand message, a sort of lens through which to see the rest of your accomplishments. Though this statement may not be necessary for a job application (probably depends on the industry), I think it can really help your MBA application.
Hope that helps. Good luck with applications!