Wont the poo log type manifold be tapered to level off the imbalnace in airflow? albeit not perfect but surly if you move the inlet on that same manifold its not flow well at all,kinda not feeding 1 as good as 4 and 2 not as good as 3? if you know what i mean
You could always make an actual poo log type,same size from one end to other then letter box it and run a remote tb. I think that'll flow better than the previous log poo type.