Well, might as well put in a few drop additions to balance things out a little drop-wise. I'll use the Auroch Beetle and Scrap Bot as reference points here.
Shellshocker
Shellshocker Shell: $1993651; 1 in 50000; +39.87302 (Had a sick desire to get that in there.)
Gal Roach
Rose Helmet (thematically fitting): $2013; 1%; +20.13
Romance Armor (thematically fitting): $93527; 0.1%; +93.527
Stage 2 Poison Rune: $2; ???; +???
Stage 3 Poison Rune: $3; ???; +???
Sentry
Bone Pistol (why not? Pretty sure bones would fly if these things blow you up.): $196081; 0.02%; +39.2162
Steel Block
Stage 4 Hardening Stone (fitting of the monster with the highest defense stat): $4; ???
Znake
Wood Armor: $35578; 0.2%; +71.156
Dome Shroom
Knight Shield: $76047; 0.1%; +76.047
Shroom Warrior
Long Sword: $55654; 0.1%; +55.654
Azulong
Taiko Drum: $36577; 0.1%; +36.577
Stage 2 Ice Rune: $2; ???; +???
Scrap Bot
Stage 4 Hardening Stone: $4; ???
Blizzer
Protection Armor: $62658; 0.2%; +125.316
Feral Beast (Man, these guys don't appear too often, do they?)
Compound Bow: $5600; 1%; +56
Pellet Spitter: $148297; 0.05%; +74.1485
Demon's Fury (perfect nod to its demonic cry): $148877; 0.05%; +74.4385
Infuriator: $238328; 0.05%; +119.164
Several Drop Additions
Re: Several Drop Additions
Support. Maybe also add seprent staff for cionic organism and dilo shell for armed dilo?