Good Morning Timothy, I'm up taking my morning breathing treatment and figured I would check the forums.. Honestly with the new pets it really depends on what you are fighting ,the resistances of the pet /damage type of what you are fighting as well.. a pet with 500-600 with say 75-80 fire RS fighting something with 80-100% fire damage will see lil stam lose as well.. But the reason many that can take a lot of their pets to 700-800HP (especially with a chiv build ) is because stam lose is mostly based on how much spike damage a pet takes and how long it remains at that low lvl can effect the swing speed based off its stam regen and how often the pet heals or is healed by its master.. a pet with say 100 Hp would be at 100% HP... say a beasty hits it for 10 that leaves the pet at 90%HP not to big of a hit... so the pet more then likely would not take a stam lose.. but then say the pet is hit for 20.. that's 20% in one hit.. that would cause a lose of some stam and lower the swing speed.. there are of course other things that cause stam lose , such as moves, and spells that hit pets.. but the increase HP just increases the threshold for normal spike stam lose.. Its more about what you will be fighting, the pet and how ya belt it.. as well made pet can easily be in the 500-600 HP range and be as effective as one at 700-800hp..
Bane Dragons are one of those pets that its fine to have them at 500-600 HP as their passive allows them to side step a lot of damage there for keeping their swing speed at max through the worst of aoe.. There are many fine build for banes atm.. If you like I have a few of the spec already maxed out and would not mind meeting you on test and allowing you to test drive them.. The pure single target chiv build is pretty sexy if the pets has the value to pull it off... its just Ai and chiv.. allowing for the huge burst of Ai and chiv combo.,.. while melting the lands with the banes passive.. My 2nd favorite is the Goo, Ai, magery bane.. This plays off the bane being able to buffs itself with magery/eval combo to increase melee and AI damage, and the pure power of goo and the banes passive just sending a double barreled shot gun of damage to everything around it in the from of the 1 , 2, goo and bane passive firing off all the time.. very effective for clearing thick spawns groups.. There are many many ,more and some interesting one I've seen other people make that are fairly effective too..
Armor ignore is the king of single target.. there are other combos that have been made that play off the players build to buff their damage that are super effective as well.. but for pure damage out put this one move is the one best tailored for most fights and in my view most pets that can have this should use it in their spec.. but that's for my play style.. its always best to go to test and see if you like the other build such as the pet buff builds...then make a choice on if the move works best for ya,, Hope this helps mate.. sorry if its abit hard to understand.. I'm freshly awake, take a breathing treatment , and rather sleeply.. hehe.. if ya have any other questions feel free to post here, or message me as there are many fine testers here that will share their build and finding with ya as well.. until then.. have a wonderful day =^-^=