I used to cast reel up with rods to about 13ft using a multiplier. As rods got longer and longer I switched to the down position. I've been on the fixed spool for the last couple of years and gone back to high reel on a 14ft 6rod and it's no problem. Don't be blinkered, try it out for yourself and see what you prefer. Fixed spool low down feels awful to me but lots would disagree. Don't forget reel position has a massive effect on the effective casting rod length. Push the reel 10inch up the butt and your bottom hand moves with it and your rod becomes shorter to cast. Hence why some guys are using 14ft 10 rods when actually they are only using 13ft8-14ft to cast.