Mana Regen in season 5

When i calculated out to level 7 here is what i got for mp5 regen

Mages 9.45/13.07/16.86/20.82/24.95/29.25/33.65

Traditional support mages (support champs riot doesn't like because they heal or shield) 11.3/14.02/16.86/19.83/23.02/26.24/29.74

What Janna gets now 6.9/7.5/8.1/8.7/9.3/9.9/10.5

What Ahri gets now 7/7.6/8.2/8.8/9.4/10.0/10.6

Am I doing this right?

Why are traditional support getting less mana than mages? Support tends to have larger costs, and need mana more. More mp5 for Janna is still usefull. and by level 4 these numbers surpass what you get at level 18 right now.