This is not thought at all. Your missing the whole point of blast and cruise. Personally I would skip your cruise and just combine the weeks to run a standard 14 week cycle.
you will see better results than what you have laid out.
18 weeks is not a blast and cruise its just standard cycle that you cut your drugs in half as soon as they actually start working. Its stupid. Blast and cruise is essentially meant for guys who are not EVER coming off and are ok with that.
This is my schedule not the only way but, how I do varies slightly as approach a meet may add a Drol or Halo maybe both.
12-16 week Blast ( High Test / Tren/ GH
4-6 week Cruise ( 500mg Test/ GH)
12-16 week Blast ( High Test/ Deca/ Eq/ GH )
4-6 week Cruise ( 500mg Test )