I often find my self struggling with that as well killer
play against me and we have an even match - like ever :-p
Its often ok for me to go early with the ACU to the middle (because I play not against pros :-p) and reclaim the wrecks by patrol move - thus the ACU stops reclaiming if the storage is full. Of course, that is only good in the first 6-8 minutes if your 1vs1 opponent goes to the other mass point otherwise I would try to reclaim as fast as I can all the mass so he can't use it as well... In that time I build up a lot of PGens and facs. As far as I know you need 3-4 PGens for every Mex T2 upgrade?! Its up to you and your strategy what you build first...
or in 1vs1 find out with scouts where the opponent sends his ACU and go to the same position and do it like in 2vs2 and send engys or drones to the other spot (as a player in our range ... very hard to play I think
)
To get more mass out of the wrecks ...
Last time I started with a BO of 1 landfac (BO: 8 engys, 10 tanks), 3 pgens, move ACU to the middle,
#1 engy -> 1 mex, 1 carbon power, landfacs
#2 engy -> 1 mex, support #1 engy,
#3 engy -> 1 mass storage, build pgens
#4 engy -> support #3 engy -> pgens, pgens, pgens ...
#5 engy -> mexes + radar + pgens ... and so on
I'm absolutely sure that this is not the best way because I'm a noob, but it worked better and the mass storage was nearly finshed as the ACU arrived in the middle.
Make sure you stop the radar if you don't need it at the beginning and don't build air units because they take a lot of energy...
BR
some points were already said by uber because he was faster - I post it anyway in the hope of some feedback to my ideas...