Replying to Full tilts

i know there are tons of threads on full tilts but please go with me. My dad doesnt like the fact that i'm looking into full park specific boots (hot dogger), and wants me to get a more all around boot so i m thinking about the classics. I went to a bootfitter today and tried them both on and what i noticed was that i could feel tightness in the heel of the classic, but not the hottdogger because of its thinner liner in that area, question 1.when i heatmold classic will i nolonger feel the tightness? question 2. what is the "bootboard", difference between rigid and active, question 3. what does the Flex 6 stiffness translate into a normal flex rating i.e. 100,120 etc. question 4. if i want to get into eastcoast tree skiing and even if i move out west and start pow skiing is the classic good for that?