you asked a really broad question.
in order to figure out what ranges you need to be jamming in spots like these you need to start messing around w/ programs like icmizer/icmexplorer/sngwiz. with these programs you simply input the data from the hand history and it will spit out a range based on a number of factors. for 45 mans and bigger mtt's it becomes a bit more difficult to really pick an optimal range when we are not on the bubble. calculating cEV can help you start a foundation for a range and then comparing that with icm/nash ranges can help you refine your range.
i would suggest using icmizer.
http://www.pokericmcalculator.com/icmizer/#default
its a really solid free program that accomplishes all the same things as sngwiz.
just remember that the ranges you get from these programs are not %100 perfect. we have to make assumptions on our opponents calling ranges and things like fold equity/blinds going up have effects on our decisions that these programs cannot calculate. just take it all with a grain of salt and keep working at it.