Hi, I purchased two Toto ultramax 1.6 toilets on craigslist. I replaced the refill assembly with the korky one recommended for Totos but did not yet replace the fill valve/flapper. The toilet does not flush waste well. Looking in the tank it seems like the fill level is really low. (see attached photo) would replacing that fill valve and cutting it higher (and raising the refill tube) solve the problem or is it something else?