Advanced techniques for Roux
There are a couple of techniques which come to mind for improving you blockbuilding and influencing later steps and such.
Influencing the second block
Influencing the second block during the first block may not sound very specific or important, but it's crucial to get your times as low as possible. Here are a few cases, experiment with them, then make some of your own:
Making the second block not too inefficient
Some cases for the second block are really annoying. You can try to apply Multi-slotting to reduce cases. There also are many cases where it may look like it'll take many moves, but it won't. Here are some cases which may not be immediately apparent in solving.