Why the partnership? 

When an IRA that uses a non-recourse loan invests in real estate, it will trigger unrelated debt financed income; as a result, it may be best to perform such transaction under a solo 401k plan because a solo 401k generally is not subject to UDFI. 

A lot of the forum posts I have read dealt with buying into partnerships with this money, but this doesn't seem to apply for an existing LLC partnership that we are already 50/25/25 members of.

Should i pull the trigger? 

The key is that after a certain amount of time, you have to be prepared to pull the trigger.  

I was wondering since a name change will trigger the due on sale clause, if do a quit claim to the DBA and make it Jane A Smith, the lender wouldn't know of a new title owner.

Have a conversation with them and find out why they haven't pulled the trigger yet.

Once they are paid off (with a preagreed return also added on) that they would leave the partnership and I would become the sole owner and begin collecting myself.

General Partnerships are exempt from paying excise tax.

@Mike Sivert welcome to BP, great place to find mutually beneficial partnerships.