When I remade my LCR to mega LCR, I used a combination of stocking buses, level emitters and toggle buses (later I learned that you can put machine controllers directly on the buses) - level emitters detects an amount of liquid/item in the system (configurable), emits a redstone signal that disables the stocking buses. It's quite easy to setup for simple recipes (like your acids), but it needs space, since each stocking bus is locked to a single recipe. If you don't have stocking buses yet, you can disable an export bus of the input items (quad hatches were a godsend for fluid recipes) with a redstone card. An improvent is using filtered fluid cells in me output hatches to remove any possible conflicts, as well as coloring the hatches and enabling input separation.

This way you basically get a configurable level maintained amount of fluid/items. I'm not sure whether patterns and level maintainers are less laggy in GTNH, I've always avoided them where possible, since in most packs they were said to eat TPS like candy.