What would you recommend for the most natural results, 295cc OR 255cc moderate profile or full profile?

The difference between the implants you've cited is less than three tablespoons.  Cup sizes are not standard across bra makers, and implant sizing is NOT based on height, weight, BMI, or desired cup size.  This is something you will need to do IN PERSON with an experienced surgeon to determine what works well for you, and to get advice about if what you like is possible and what to expect with regards to results.  Be sure to discuss your goals and concerns with your board certified plastic surgeon and consider the pros and the cons. Be certain your surgeon is properly certified.  I've attached a link where you can start your search.  

295 will not be too big for you. that being said the smaller the implant and the less projection is always the most natural.  however I believe that you will wish that you had gone bigger

Hello and thank you for your question.  The
best advice you can receive is from an in-person consultation.   The size, profile, and shape of the
implant is based on your desired breast size/shape, your chest wall
measurements, and soft tissue quality.  This decision should
be based on a detailed discussion with equal input from both you
and your surgeon.   Make sure you specifically look
at before and after pictures of real patients who have had this surgery
performed by your surgeon and evaluate their results.   The most
important aspect is to find a surgeon you are comfortable with. I recommend
that you seek consultation with a qualified board-certified plastic surgeon who
can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.  FACS
Harvard-trained plastic surgeon