"You can't say something is "less more sticky"."
But you can say something is 'more or less sticky'. English is strange, eh.
The comparative and superlative forms of adjectives swap out 'more' for '-er' and 'most' for '-est', but you can't combine them such as 'more stickier' or 'most stickiest.' The word 'less' does not swap out for the suffix '-er', so just think of 'less' as a replacement for 'more' and be sure not to use the comparative ('-er') or superlative ('-est') suffixes.
Cheers,
Jack (youtube/efljack) (youtube/grewords)