@Drop rates as well as what should be good with drop tables in my opinion.
Move Zamorakian Spear to K'Ril Tsuratoth drop table(being dropped at same drop rate as Staff of light From Commander Zilyana). As it is losing it's value totally there at Mithril Dragons even though it's 1/200.
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For Bandos, add Bandos Boots to minion drop table with higher drop rate than Graador.
For Zamorak, add Zamorak Spear to minion drop table with higher drop rate than K'ril.
For Saradomin, add Saradomin Sword to minion drop table with higher drop rate than Zilyana.
For Armadyl, add Armadyl Boots to minion drop table with higher drop rate than Kree'arra.
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For Mithril Dragons, to lower a visage drop rate 1/750 or 1/800, considered how often they are killed off-task.
For King Black Dragon, to drop Black Dragon hatchling as well 1/1000.
For Skeletal Wyverns remove Saradomin Armour and replace it with skilling supplies and alchables.
For Hellhound remove Zamorak Armour and replace it with skilling supplies and alchables.
For Gargoyle remove Guthix Armour and replace it with skilling supplies and alchables.
For Obsidian Dragon to drop noted both hides(trip takes up to 7 - 9 kills depending if you get stacks or items worth something)
For Bloodveld to drop Blood Runes as it is original drop being famous for.
For Chaos Elemental to drop Rune Essence more common than Yew/Magic Logs. Also, remove Comp bows as they are useless on drop table and should be move to(easy, medium, hard) clue rewards.
For Chaos Druid to drop all sort of herbs(higher than irit herbs less common) and be aggressive to any level.
For Chaos Dwarf to have any sort of drop table, cause they're one of NPCs not worth killing at all.
For Jellies/Trolls to remove Granite replace with Rune Items instead. Granite should be exclusive to Gargoyles only.
For Dagganoths(74 and 92 Level) to drop big and normal bones respectively instead of dagganoth bones which should be exclusive to Dagganoth Kings and/or Dagganoth Mother.
For Dagganoth Kings make Dagganoth bones one at a time or noted all three.
For Poison Spider to have a 50 red spider eggs noted drop 1/1000.
For Hill Giant drop less Black/Steel useless items, more skilling supplies.
*Skilling supplies can be herbs, ingredients, unfinished arrow shafts, bolts, arrowtips, flax, uncuts(not in noted form), logs, ores, bars, raw/cooked food, rune essence.
It's just my thoughts.