I think you will find that the Paterson tank and reel are likely implicated in bromide drag. I've done a ton of testing over the past several years and found that the more contact the film has with its support structure, the more drag you risk. Similarly, getting the reel of the bottom of the tank lets gravity pull away the byproducts during stand and reduces the risk of streaking.
For these reasons, I use only Nikor stainless reels in a tank twice as large as needed. I invert a funnel at the bottom of the tank and place the loaded reel on top of it. This suspends the film well above the bottom, and the Nikor reel design appears to have minimal tendency toward bromide drag since so little is in contact with the film. YMMV