Fire Cape for all tasks, I used Bandos Chest Plate + Verac skirt until I could afford tassets, which I bought before dragon claws. Also, you didn't specify whether or not you cannon. If you currently do not cannon almost every task, I would recommend that you do, as this will greatly increase slayer exp/hr more than bandos/claws.
Complete family crest to obtain cooking guantlets. Cook lobsters to 81, Swordfish to 90, Monkfish to 94, Shark to 95, Rocktail to 99. Use cooking urns with all of the above. Or make wines, which are currently around 2.7 ish gp/xp
2) The best place to chin would be ape atol skeletons. 3) The best non void set up would be full pernix, ranger boots, soul wars cape, fury, barrow gloves, archer ring (I), unholy book, red chins. Although, it can be downgraded to armadyl/black d hide, snake skin boots etc. Sorry I have no idea on ques 1.
For your second question, the best place to kill blue dragons is cannoning them in the resource dungeon in taverly. Bank the bones/ hides using a war tort. As you have 86 herb, you should use zamorakian spear/ korasis sword + d def/ leaf bladed sword + d def using super anti fires.
http://runescape.wikia.com/wiki/Calculators/Miscellania At the minute, the best profit per day is coal, followed by maples, although this is not taking into account the value of seeds inside the birds nests. I would suggest 9 on maple and the rest on coal, as 9 workers is all you need to get the max number of bird nests per day.
I am not quite sure on method of collection but seems a good plan to me. You cannot however give feathers to a beast of burden, so no b.o.b works. 5k may be slightly too many, i'm not sure i've made 2k and i have around 1.2k left still after around 4/5 months of using them, although I only use for dragon slayer tasks. Looking on youtube i've seen a method which claims around 950 feathers at 99 thieve using a larupia and completed eagles peak, have a look.
Berserker ring > Fury> Extremes > Turmoil/SS > BCP > Tassets > Overloads > Claws This is the order in which I got them, not sure if others have different views. Also getting a rapier will benifit you a lot in the long run.
Full slayer helm, ahrim top and skirt, staff of light/chaotic staff, arcane stream neckace/fury, inf boots, barrow gloves, seers (i), arcane spirit shield/mages book/unholy book, fire cape. Use fire surge and pray/deflect mage. Use either wolper scrolls or extreme magic potions.