Welcome to the fourm!
Can you explain "low tie" for those of us with a caffeine addiction (haven't had enough yet)? Do you just mean that you will be hanging close to the ground? All the ridgeline (structural) is going to do is set the same sag everytime. If I understand your problem correctly, you are getting too much vertical drop when you get in and it's causing you to bottom-out. A tightly pulled ridgeline will lead to more drop when you load the hammock. Only cure I know is to put more angle in your suspension prior to loading the hammock. But, this usually requires tying off at a higher point.
Probably doesn't help, but maybe I'm misreading something. Wouldn't be the first time.