IMO,Limbsavers work better than Bowjax,but either will work
Broadheads: i've tried several different fixed blades,2,3,and 4 blade. some are harder to tune than others. In my experience,the bow will let you know what BH it likes just as a gun will w ammo. My favorite head so far for flight,penetration,and damage is Slick Trick standards and Mags in 100gr. two of each reside in my quiver as I type. 2nd would be Muzzy. I also have a 3 blade 100gr in my quiver. penetration through shoulder is great,though I dont intentionally or reccommend deliberately trying to take out heavy bone. I've also shot Wasp 100gr 3 blade and they do a very good job. Equal to that of Muzzy and ST,though the blades seem to be thinner. Golden Key used to make a head called the deadhead that were awesome. I'd probably still shoot them if they were available. I've tried Thunderheads in 100 and 125gr and they plane to much for my liking. NAP Nitrons fly great,but use TINY screws to retain the blades. won't buy those again either.
I've only had 1 bow that would shoot a Magnus(yellow/black 6pk) worth a dang. I won't be shooting them again. Steelforce makes an excellent 2 blade head as well and also have a lifetime warrany.
For sheer strength and durabilty of the ones I've listed,I prefer Slick Tricks and Muzzy. the blades won't pull off the ferrell due to the way they lock together,and from my bow,they both have FP flight and accuracy. as was stated though,a well tuned bow is detrimental to the best broadhead flight. The best value for the $$$ goes to Muzzy. $28-30 for a 6pk is hard to beat.