I had the same feelings and experiences with the coil in the beginning. It sounds like you may be detecting in heavily mineralized soil. With the larger view that the WOT gives you, it will magnify that mineralization, and cause a lot of falsing. Typically, 0031 on your display.
What I found to work well for me with the Wot is to only put it on after running into an area that runs relatively quiet and smooth with the stock coil. The WOT will allow you to see a larger area than the stock, and occasionally a little deeper (maybe another inch). Also, with the WOT I run my iron mask at 16. If you get 1 good hit after 4-5 passes on a deep target, dig it. Many times is will turn out to be good. I have often dug out 6-7" and have not gotten anything on my target with the SunRay probe. Then, after taking another shovel of dirt out, I could hear a signal at 9"!
With a larger sweet spot than the stock coil, and the extra inch in depth, I think you'll find the coil worth its time and money. It does seem to hit silver harder that the stock coil, and it appears to see coins that are at an angle or on edge better, as well. I saw mention of the SunRay 12 in one of the other replies. I have owned that coil,too, in the past. It is lighter than the stock coil, with a little better depth, but not as good as the WOT. It tends to false on wet grass and bumpy ground conditions.
Remember, there just is no one coil or metal detector that perfect for all situatons....
Good luck. I own the Platypus, too. It is a good one, but that is another long story.