Stop building attack speed boots on graves and I think you still rush Youmuu's.
Also, I don't see why you're lying. Over the past month you've only played a few games.
25 days ago you had a Heimer game followed by 2 graves games. The first 2 games got you into the series and the 2nd graves game gave you A series win via promo helper.
Then, based on the rough LP win/loss of +22/-19, we can determine that following the 3 graves wins you'd be at 66. After the 2 losses (1/7/9 graves and the Lux game) you'd be at ~ 28 LP. You then won 2 games putting you at around 70-72 LP and the game you played tonight would've lost you around 18-20 LP, depending where you were in the 70-72 range (putting you at 52, where you are now). You did not lose 48 LP, that's literally impossible. What else is literally impossible is losing a series in one game, and judging by the fact that you're not in a series after that one loss means that you actually never were in that series.
I don't know if you're trying to fool a red into giving you a series/promo but you couldn't even fool me.