There's no big differences between phase 1/2 just higher multipliers. You can just start burning shakes now. It does take significantly more stamina to actually reach stage 200 and the odds get worse faster, more x's. Depending on what your multiplier is I would save your radars if you think you can easily reach 51k without them, if you get 2 r/sr slayers it should be really easy. Also you should probably use glasses on 150 and 190-200 since their odds are so bad, it might be 195 that it starts being only 1 correct not sure.