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Please stop explaining to me how drip feed works or should work. Whats pointless is your continuing to advertise your service here and put new threads / URLs on every post.
Again, some APIs allow you to submit URLs with a parameter to index delayed or not. Some also allow you to have an option for the day limit or URL limit per day. If they have such 2nd option for details, SER decides a random value between 10 days to get the URLs indexed. Thats the most natural way in my eyes. Your indexer seems only to support to index all URLs delayed or not. Thats not a setting for it than.