you can do your work raw. use your shirt to find where the transition point of it is, and use that point for your work. do not neglect the bottom end of your bench, i still do zero momentum around once a month and do full range bench on my warmups, up to around a three rep max
shirt work does not have to be done every week. you need to do some actual work on your own, as a good shirt WILL assist more than you want. over time this can create weaknesses of their own which will result in failure or injury. shirt work should never be included as a max effort movement, but can be done after a max movement