Shard Bombs are really weak damage wise, maybe make them have double damage.
Salt bomb: normal + shadow (or elemental + shadow)
Sun shards: elemental + piercing
Shard bomb: normal x2
Crystal bomb: elemental x2
Dark matter: shadow x2
Splinter bomb: piercing x2
One thing that really made the previous sun shards shine was the elemental + piercing damage combo.
I would also consider invisitinks to be thrown out/not as persistent.
split specialized damage isn't as powerful as one specialized damage alone.
damage-wise shard bombs are extemely underpowered, you really feel that when using shards on neutral enemies or using deadly shard bomb.