Youtube updated video ranking ?

I think that youtube did something to video ranking.I have been succesfully ranking my videos before,I know how to rank them, but in the past 3 days It was imposible to do it.One of my videos has 2k 100% retension views and it is in like 15 th page or so...In total I uploaded 25 videos and boosted them in that period.All of them should be ranking between 2 and 8 th page by now, but they are all ranking from 15 to 25 pages.
I am sure this is not keyword placement or anything, because my other 10 videos have ranked good comparing to views/likes/comments I gave them.

Does any one have same experience as me in the last 3 days or so ?

Even worse today.Almost all of them lost ranking even though I boosted with more views.

Maybe your competitors have even higher views than your videos? That's why your videos lost your rankings. I haven't check my videos yet if they have also lost their ranks.

SpookSEO said:

Maybe your competitors have even higher views than your videos? That's why your videos lost your rankings. I haven't check my videos yet if they have also lost their ranks.

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Not really they have same amount of views as videos have in other niches.I don't think this might be the problem.
I have noticed that 15 of my videos are still at 301+ views 3rd day.Others with 3k+ high retention views are somewhere in 20th page.Something is wrong here.

My videos ranked down too.

Do you know how i can get my videos ranked higher?i heard about a keyword method but im totally lost..thanks if you can help