Finally i had some time to do something on printer.
After last test i printed new (different) tensioner for y axis. During replacing i found that y axis 2040 profile is very weak. In this printer its bolted to horizontal bar just by 4 bolts near center of y axis. But the end where tensioner is mounted have a play of about 2mm in z direction. Probably i will need to design and print some stiffener.
Anyway new graph with new tensioner looks even beter.
Its time to do some test prints.
I dont have any springs/silicone under bed. I mounted it directly to y carriage. In tarantula carrage have bended arms which also could acts as springs.