Another method is to keep #mannerisms and #dialogue from butting into each other:
She took a drink, looked outside. "The problem is we tried too hard."
Above, you show her #hesitancy through #actions - drinking, looking away - not dialogue tags.
Or, create the #pause w/ an unobtrusive "said" tag:
"Problem is," she said, "we tried too hard."
Or, show a pause w/ just an #ellipsis:
"The problem is...we tried too hard."
#mannerisms #dialogue #hesitancy #actions #pause #ellipsis