Since both of these weapons have some problems I though I would give some catalyst ideas to help them out. For thorn I would have the catalyst give 16-20+ range and increase the duration of soul devourer by 3 seconds.
For cloudstrikes catalyst, since like thorn with range cloudstrike struggles immensely with flinch, to give it no distractions and increase the window to which you can land 3 headshots and the get the lightning storm affect for the catalyst. That's all for now!