No, you simply need to insert the new stop at Fulgora, add the same waiting condition as Nauvis and maybe click manually once on the stop to force the platform to go to Fulgora it it has already left Vulcanus. You could also add a second stop at Vulcanus to fill up with belts for Nauvis and insert ...

I see 24 chemical science pack assemblers, they should be paired with 12 logistic science pack and 10 automation science assemblers/military science assemblers (of the same assembler type).

If you insist on not upgrading the first assemblers, you'd use 15 automation science pack and 18 logistic ...