Currently, some DT recipes (most notably for processing Oil) are for small batches, like 50mb. This is smaller than native GTCE recipes, which results in the problem of the recipe's duration capping at 3 ticks after only a few overclocking tiers - for Oil, at EV. This makes oil processing quite a bit less attractive to players, as you have to make multiple Distillation Towers just because you can't overclock them above EV.
As such, I suggest increasing the batch size for this (and maybe some others, will check later) recipe to 1000mb - i.e. just multiplying the inputs, outputs and duration by a factor of 20.