Tips for Better underside?

Hi there folks, I am new here so be gentle ^^

I have just a quick question. I did the print attached. The top side looks great. really happy with it but the under side (due to gravity I guess?) is not looking so great as you can see. I did it with support but yeah still get this wiggly saggy-ness. Is this just a limitation of the technology and I just need to find a work around or is there something I am doing wrong.

Any info welcome.