2/5 rule not met. How to proceed ? Risks ?

Hello

My family and I , we landed in Ontario on Jan-2009. Stayed for a week only and left Canada until now. We obtained our PR.
Now that we are ready to move to Canada and settle down (after more than 3 years), we might face problem with the immigration officer because of the 730 days rule not met (as only 16 months will be left before PR expiry).
My son (still minor 17 year) has been accepted in a Quebec university and my other son 15 yr in a secondary school.

My wife will be entering Canada with my 2 sons. I'll be joining them couple of days after to minimize risks.

Q1: With a freshly renewed passport, shall we take the risk to fill the questionnaire form as if we were spending 2 weeks vacation ?
What will be the consequences if we get caught ? Worst case, , we couldn't even hope for a PR renewal even when hiring a lawyer? In other words, what's the price for a lie "excuse the expression".

Q2: is a freshly renewed passport, may be an additional factor to send us to immigration officer or it's better ?

Q3: Would it better to be honest and say the truth (reasons: I couldn't find a job in Canada to support my family and also kids studies following french system , so we had to wait until high school). In this case, the officer (even if he tries to be nice) is he obliged to report us as not meet the 730 days rule.

Q4: Statistically speaking, what are the chances to lose a PR when not meeting the 730 days rule ?

Q5: In which cases , the officer decides to give 30 days' notice to leave the country ?

Thank you