Have you actually done this problem with a small pencil dot and the correct method? Using my 35 year old CRP-5 I have no problem in getting the right answer, mind you that's with 40 years of experience!
Remember the question is asking TK & GS not HDG & GS.
1. Put in wind DOWN.
2. TAS of 170 on centre dot (grommet).
3. Turn to put heading on 100 at the top.
4. Pencil dot should now be on 8/9 right drift line at about 183 kts.
109 at 182 no question.
Check your CRP-5 is not too slack and the grommet remains on the centre line at all times when moving up and down. If not it could explain some of your problems.
Also remember wind blows from heading to track answer 4 can't possibly be right before you even start.
You could of course draw a vector diagram to scale, but you won't have time in an exam for that. Get used to using your CRP-5 accurately then quickly.