Vibrant Visuals FPs Inconsistency

I'm really pleased with the performance of this beta using Vibrant Visuals, however only when i use the Performance template. As soon as i make the slightest change (even lowering one setting), my FPS drops significantly. Changing that one setting back, it won't recover to the consistent 60fps, until i switch back from Custom template to Performance, even though the settings are 1:1.