Consider a pneumatic actuator with a positioner, air lock and volume booster on.
I can understand the reasoning for putting the air lock last (ie next to the actuator) so when air is locked in there is less potential leakage path.
I am in doubt of what your 'air booster' actually does in your circuit, a flow diagram would help.
Anyway you have to consider that through a flowpath the flow is a function of the total Cv of all components in the path. If you do not alter the amount of air or input (or output) pressure or the size of output/input flow diameters (eg. the Cv), then the order of the components will not alter the flow.
Have you checked that the pipelines and components (solenoid valves) before your described components are optimal and do not add to your problem by giving additional restrictions?
If your actuator is a 'critical for safe operation device', highest possible security should be sought: original placement of booster and larger size. (If your diagram does not convince me otherwise!)

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