We all know(well, most us knows) that the crystal bomb line can only reach 4 star and it's overpowered. To make a 5star of it three ring must decrease the damage of radiant sun shard( 4 star) and then make a 5 star of it with more damage. Hope it makes a bit sense. ( Same for the Ionized salt bomb line )
And made some names up as well :D ( And their special ability)
Radiant sun shards(4 star)------> Perfect sun shards (5 star, versus fiend VH. The orbs it shoots out can bounce away when it hits a wall or enemy, like Magma driver's bullet.
Ionized salt bomb ( 4 star)------> Plasma salt bomb ( 5 star, versus slime VH. Causes strong shock. The orb works the same with Perfect sun shards')
:D If you like it, +1 :3
For those unaware, both the Crystal lines had their damage reduced by an approximate accumulative two bars of damage as the 4*. It is still a very powerful bomb against a few (1-3) targets rather than many (4+) and deals respectable damage regardless of this nerf. Ionized Salt is somewhat balanced as it currently is for certain uses, though the degree of shock could be increased.
After going through your proposed 5* mechanics, it would be far too overpowered. No, I am not going to give a fancy analysis of what is wrong with it; this time it is as obvious as a chair on your face.