[VS6000 (Tim)]

Hi guys!
So story is, bought a star adventurer to use with my Nikon dslr (d810 with 70-200 2.8 and sigma art 50mm mostly)
all went great when I got it about a year ago, managed 30 second subs with a 300mm f4 easily with only laser and eye alignment method. flash forward after a break and last night, I finally used my polar scope and nailed octans perfectly. thought you beauty, gonna get awesome results here!
very disappointed. this attached is 30 seconds at 200mm, 15 seconds looks fine but this is terrible. I checked alignment during and it was fine... any ideas what's happening here?? 4 minutes at 50mm was terrible too. Doubt its camera shake, using a timer and going by the movement.. but could be wrong. Also seemed to be better when I removed the counterweight setup..
any help much my appreciated, cheers!!
Tim