Make sure that you leave little hills and valleys at the bottom of the row. That way the next row will nest into the previous and you won't see a line.
Brilliant! Thanks for sharing your technique. I only have done outline quilting on very small pieces, because I couldn't wrap my head around the stippling, either! So thank you! I'll try it!
When stippling and meandering I have to keep telling myself "round corners" or just "round" to avoid a pointed spot or loop in my quilting...just another tip!