With TJIs you have an even bigger fit issues when using batts, since batts are typically designed for the nominal 1.5" thickness timber dimensions, not TJI webbing. Almost every high performance house I've seen with TJI rafters has used blown, not batts, and with good reason

The batts are 24" wide and the TJIs are 24" OC as well, so the thickness of the TJI will put the batt on the TJI.