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So DC 17 to get suspicious? I didn't read that part, but I haven't looked in the DMs Guide to heavily. I gave my DM a heads up to keep an eye out for possible problems, so the trap finders don't feel like it is impossible to find traps.
Okay. The DC 27 referred to in the OP is to spot the control panel for the trap. Merely to become suspicious that something is amiss the DC for the same trap is only 17.
Now, for the hardest DC at that level, 23% doesn't seem that bad at all. Especially considering that your Rogue isn't even a specialist trap-finder.
My real experience with traps is that they are as easy or hard to find as the DM is sadistic. If you found them all they wouldn't represent a challenge and if you didn't find any what's the point of looking for them? Somewhere between 23% and 60%+ percent to find traps of your level if you are actively looking doesn't seem unreasonable at all.
As far as the no 10' pole thing goes, there will always be creative ways to find traps without perception (unless your DM is sadistic, see above). Having your fighter throw Splug or the corpse of your last enemy down the hall can sometimes do the trick.![]()
So DC 17 to get suspicious? I didn't read that part, but I haven't looked in the DMs Guide to heavily. I gave my DM a heads up to keep an eye out for possible problems, so the trap finders don't feel like it is impossible to find traps.