Roth IRA vs traditional IRA for graduating resident

[ENT Doc]

Can you just leave the $500 in the traditional for 2017 and add $5000 more to it to reach your $5500 non-deductible TIRA?  Also, can't you just add $3000 more to the Roth for 2016?  The only money you really need right now is the $3000.  If you have it, just put it in to max out your 2016 Roth.  If you really need the $500 in the TIRA to max out the Roth you'll have to recharacterize the money to be Roth when you switch funds.  Not sure how to do that on Wealthfront since I don't use them.