Self-leveling pour is not flat

[pls]

I am redoing a powder room. It is only 24 sqft. The floor is not flat (maybe 1/4 in from highest to lowest spots) so I decided to use a leveling compound. I screwed plywood to the the subfloor, applied the primer, let it dry and then poured the self leveler. I used Mapei Self-Leveler Plus and used the high end for recommended amount of water. I poured out about 3/4 of a bucket and pushed it around until it looked even and then I went over it with a blade. When I was done it looked perfect, surface was very smooth. As soon as it was dry enough I put a level on it and the high spots were still high. I probably got rid of half of the variation but I am disappointed in my results. Any suggestions on what I might have done wrong?
Thanks
Phil

[Gozo]

You can use a rub stone to reduce the high spots. SLC isn’t designed to be a wear surface, so it’s softer than regular cement. For an area that size, it shouldn’t take too long.

[jadnashua]

Surface tension will tend to follow the variations in the floor unless it is deep enough. Many of them want at least 1/2" over the top of the highest point on a wooden subfloor. You can do it with less, but it takes more skill.

IMHO, they shouldn't call the stuff 'self-leveling'. Keep in mind, even water isn't exactly a flat surface as can be seen from a droplet on a freshly waxed car.

[ryanfornkohl]

Lol a rub stone. I bought a 7" grinder with diamond blade attachment and gave up. I poured SLC and had the same problem in a 25sf bathroom. Ended up breaking it all back out and leveling the joists with shims and plywood. Good luck.