On a 10km 5v5 with ~35,000 reclaim, a Strat by ~10:30-12:00 is not unreasonable. Additionally, having your teammates build Flak and a few Inties negates most of the risk from said rush. I find myself wishing the rush carried more risk, possibly by taking longer to achieve. Is the ~10:30-12:00 Strat an outlier? It seems like the standard for my range (I play ~600-1400).
Simply increasing the cost & time of the T3 Headquarters upgrade specifically seems like the obvious answer, but that is a separate discussion. Is there some aspect of the ease or difficulty that I'm missing here?