I like this type of game, so if you find this useful plz let me know and I'll put more on here. I'll start from stage 4
Pause game first, make your way left, after collection >2 start make the your way to the right. Research 10% less to build, this will reduce cost 10% and gives you extra 10% pushing speed
While you have extra energy, build 2 blaster 1 by 1. Fly them to the spots shown in the map. If you are quick enough the 3rd relay will not be destroyed.
As these 2 blaster flying, put down 1 blaster near your base to clear the way. Use your extra energy to light up top right and top middle. When the last relay start building, fly your troops to that 2 spots in the picture, they will suppress both creeper generator for a while.
From here you need to pause game for planning the routine. Only 1 way will enable you to cross the 'gorge' and directly connect with the top left rift, that will safe you a lot of time since energy need to travel a long way here..... Also put down relay to connect another rift.
It takes ~5 second to suppress top left, retreat your blaster to recharge and go back as soon as possible. And then you will have your best score here.