you know wrog that's overly complicated my way for reaching 6000 was (not with numbers..) when you get launched point upwards and use all rocket fuel this should put you at about 210-220 alti
keep resistance at 1% and you should reach 6000 feet before you hit the water
i kept a steady 120 speed (at the end) so i could've bounced once/pulled up) if i hadn't reached 6000 yet