Problem related to quality of protein models in Ramachandran plot

Hello Sir
I have modeled protein structures using ITASSER modeling server. When I evaluated the quality of top models of some proteins using Procheck, quality was below 90% (ie <90% residues were present in most favoured regions in Ramachandran Plot). I have to used protein models having quality >=90% for further processing of these models. So please suggest me how can I increase the quality of these protein models.
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