Not to repeat what has already been said, but NTs have significantly more impact on job potential than PIs. To gil's point - the last 4 seasons are most of what matters, if not entirely - and your 4th slot holds a non-postseason appearance. After next season, if you make the postseason, the formula should value you a bit higher as that non-postseason will be substituted for a postseason appearance. However, the formula also values the most recent season most so making sure you achieve a PI F4 or better is key to maximizing your improvement.
Side note: If you feel as though it's a conference strength problem, winning the conference or having a SMART (not just strong) OOC are the only ways to lock in a bid. It looks like you tried doing that this season but unfortunately having those 2 200+ RPIs at home in there only exacerbated the problem. Next season, I see almost all triple digit RPIs (I haven't looked at the teams in depth so maybe they'll be good come next season). If you're going to do that, try and make all of them away games.
"The basic formula is 25% team winning percentage (WP), 50% opponents' average winning percentage (OWP), and 25% opponents' opponents' average winning percentage (OOWP). When calculating winning percentage (WP), the RPI weights a road win as 1.4 x a normal win, a home loss as 1.4 x a normal loss, a road loss as 0.6 x a normal loss and a home win as 0.6 x a normal win - neutral site games are not adjusted (weighted at 1.0)." is from the HD Knowledge Base.
You'll have a young roster next year but being smart with scheduling can help facilitate your success. If you have any questions about what I tend to look for, PM me. I think smart scheduling is the biggest reason for being able to make the postseason Knight ACC after some REALLY bad recruiting seasons several seasons ago.