Yeh, I'm familiar with the issue of correct alignment. For various reasons, I've done quite a few jobs where you're reaching up or round a corner to drive screws and this obviously doesn't help alignment or keeping continuous pressure down on the screw. Once a bit slips a couple of times, it's often on the slippery slope downhill. I always prefer longer bits, at least 50mm, as this helps visual alignment. The Irwin ones are ~OK but not outstanding in my experience.
I might suck it up and buy a pack of DeWalt bits to try.
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