Quite likely you are still adjusting to riding this bike and to riding recumbents in general. I had a brief learing curve of aches and pains when I started riding recumbents 4 years ago. That first Tailwind has been replaced by two other 'bents and I've had a period of adjustment to both of them. Your position does look about right. Back off a little on intensity and be sure to let your muscles recover from a hard ride.