It seems some are obsessed with Chemtrails.
Well if you claim people are giving you information you don't like it's not suprising folks think you might have an alternative agenda, I'm glad you haven't.
I just want to know why in the last year or so there is a huge increase in trails, also often crossing
There's certainly been a gradual increase in traffic over the decades, but I'm really not sure it's a "huge increase" in the last year.
Just a few thoughts. Confirmation bias? Is it possible that once you noticed the phenomonem you think you detected you've started taking more of an interest in contrails and you're only just aware how busy it is "up there"? Is the weather better this year (fewer clouds) than in previous years and therefore the trails are more visible? Have you changed jobs/working hours and are "spotting" at peak times?
As for the reliability of the "radar sites", no they don't show everything.