It's not the bike It's the engines..
So your on your first bent and you feel slower. You have saddle time now and you got your 'Bent' legs but still you feel slow.
Now you think, 'I need a lighter bent', 'I need better faster tires, etc.
Shure lighter and lower is faster but what you really need is better engines and lungs.
I stepped away from my recumbent and got on a mountain bike, what a wake up call that was I tell ya !
Out there in the sugar sand, rocks, roots, climbs, and drops you need much more powerful engines.
20 miles on jeep trails and single tracks works your body far more than the bents even with hills.
I did not have the time to devote to the hours needed on a recumbent but I can now tell you from personal experience that
20 miles on a mountain bike at 10 mph average will show you the light, If you don't pass out or have a heart attack.
Hard Intervals happen constantly in the woods. You simply must do crunches and upper body workouts, It becomes a matter of safety.
You must become more agile and light on the bike to keep from crashing.
Now when I get on my Tour Easy I can fly.
Getting more than just a little stronger on a bike or bent is hard work, remember that everything about a bike's design
is made to conserve and use as little energy as possible. So If you want to be a better faster stronger rider Diversify ...
Ok I'm done.