I would recommend mastering the most basic 50-50 D, until you get familiar enough to customize your 5bar D to your opponents. Always going between either a total shutdown of the wall, OR feathering the opposite "sweet spot" or deadbar lane just inside the next playing figure. Easy enough to vary the timing of where your defenders are, with double-backs or double-pumps, to prevent getting timed. Never get trapped in the "scrub" lane, which you can train yourself to jump to, anyway, from either the wall or the sweetspot. Especially against topside passers... who seem to hit that sweetspot even more consistently, on the reverse "up".
Of course, as you get more and more familiar with the opposing forward's tendencies and fave passes and passing series', you can adjust and fake out to bait even higher percentages. But against an unknown or unfamiliar forward, you gotta do 50-50, especially in bigger tourneys. Most of all, pay attention to the opposing forward's passing philosophy, if he/she has one. No laying off until it's your possession. That is prolly the hardest discipline to master. Either that or practice that blank stare & raised eyebrow that Ama's and below always seem to end up with whenever they face a real 5. That and crying like a baby ...