To piggy-back on what Brawlo says...
Ride_Fast, when I first started I was on a program similar to yours. It was intense...or so I thought. Then I hired a coach. During the first Saturday and Sunday sessions, I did more work (volume, intensity, calories, all metrics) than I would all week using my own "intense" program.
I'm not saying that you need a coach. Just saying that what I thought was intense was not and I was capable of sustaining a lot more volume and intensity.