Brendan... I’m sensing a bit of frustration but you’ve got this. If you can complete this week’s IQ you can do this... all is not lost!
In the title, replace P with the message spelt out between 1a and 3d. “Then” replace Q with the rest of the message (5d to 29d). Read it as a question quite literally... and you have ‘found’ your answer with the endgame.
I hope this helps but if it’s still too obtuse, let me know.