Save scum Artian CB help

I want to craft a 3x blast/attack CB and get 4x attack and 1x sharpness as the reinforcement bonus.

When I just select the first part that pops up in each section, the 23rd weapon comes with the reinforcement bonuses. When I reload, if I build the blast CB it doesn’t get the bonus as number 23.

I tried crafting only raw CBs and the 10th weapon has the bonuses, but same as the above when I craft the blast CB it doesn’t get the bonuses. When I tried it with elemental CBs, I got well in to the 20s and gave up.

I know the reinforcement bonuses are based on a seed but does this indicate that blast is in its own separate seed or rather elemental impact CBs are in their own seed?