offer accepted, 2 lenders gave me 2 different pre-approval resul

Wellsfargo guy said my DTI over 54%, so he won't do it; and BOA lady said she got 40%-43% for DTI via their automated underwriting system, she said it need to let underwrite do the detail work but she is confident, but I am uncertain now, we are in the day 2 of 5 days contigency period.. should I do it or quit? have a risk of losing $1500 if I failed underwrite.... any advise. THX!