My clan/squad started pushing challenging mode Incursions this week. We've purposely steered clear of Youtube and guide based strategies to see what we could come up with on our own. We have all cleared hard mode dozens of times, so we knew our strategy would need significant tweaking. We are currently able to get to round 15 about 25-30% of the time. We have plenty to master and work on to make reaching the end more of a consistent adventure. However, I'm asking for tried and true round 15 strategies from those who are completing it on a regular basis. Theories are all well and good, we have our own. Any CM vets out there willing to impart their knowledge?