Contrary to your opinions, it is best to get as much Resin in as possible, this will give the best and longest results. To do this fill the Vessel up to the top the push in the filter pipe, if its hard to get to the bottom, softly shake it or tap it lightly on the floor. Then cover the top of the pipe with tape or something similiar and carry on filling the vessel, when no more seams to go in, shake the vessel again and keep doing this until it wont go anymore. Make sure the thread is clean and put the head back on. I used to fill these vessels preofessionally and we used a vibrations table to get maximum resin in. If you have space in the vessel the TDS value will be/or get higher quicker.