Ocean monument does'nt spawn anywhere

Hi, i play minecraft pocket edition on a samsung galaxy grand prime, android 5.1.1, 1 gb ram, i am testing the beta version, i have created a new world with my usual seed, which is quite new anyway, it contains miles over miles of deep ocean, i searched around the sea for about a week, in creative mode by fly using potions, and i did'nt manage to find any ocean monument in something like 10000 blocks away from the spawn in every direction, and there was a lot of space for it to spawn somewhere, but it did'nt, i really think you should improve the spawn rate for the monument by encreasing it, regards