On a flat I could have stayed with that initial group but with the climb coming I knew i had to drop back. Lack of draft on a climb means all the power and speed is me alone and I can't hang on to someone else's wheel.Get in the draft and let the stronger riders drag you along. Spin slowly in the draft to bring hr down. If they are too strong wait for the next train. So many of them will blow up on a climb especially a long or double climb like tonight. I reckon we, or rather, you could have chased 2 or 3 down towards the end.
I need to do more racing and more longer rides to increase my stamina.