I don't know how to score 150000-200000 but I scored a 61250 on my first Metaverse game so I can surely get you well above 9000.
At game setup:
(1) Disable all victory conditions except for Military Conquest
(2) Select gigantic map with everything abundant (more habitable planets means more people)
(3) Select the maximum 9 opponents
(4) Select very fast research (to research the most possible in a short game)
(5) Select the hardest difficult level you can handle
As your population grows so to does your score; however, as the years increase your score goes down, so you have to find the sweet spot. Keeping your morale at 100% will give you a 100% bonus to your population growth. I won my game with > 3 trillion people on Dec 15, 2229 (just short of 5 years but the scoring rounded it down to 4 years). So I suggest trying to complete you game in December for maximum population growth while minimizing your years. Also play as neutral to get those Neutrality Learning Centers (22 units to research each!) which will greatly speed up your research. In my short (in terms of turns but it actually took me 2 months in real time to play with my busy schedule!) game I was just 3-4 turns away from completing the tech tree! I hope this helps.
Paul D.