When you are upgrading your attic insulation, the intake ventilation is often the first thing overlooked. A lot of folks get a new ridge vent but forget to properly seal and ventilate the soffits. If those small gaps in the eaves are blocked, you are essentially trapping moisture and heat in the attic, which causes huge problems later on. You need a clear path for outside air to enter the attic and the blown in insulation must be pushed right up against the baffle to prevent bypass issues.
For proper intake, the baffles need to span the entire opening of the rafter bay. They are designed to stop the insulation from migrating into the soffit cavity while allowing air to flow freely. If your existing baffling is flimsy or improperly installed, it won't do the job. I always recomend checking that the material is at least rigid plastic and that it doesn't sit too close to the roof decking so there is adequate space for air to enter the space before hitting the insulation. Make sure the baffles are the correct width for your rafter spacing. If you use somthing too narrow, you lose critical air exchange area. It might seem like a small detail, but proper flow helps the whole building breathe.