Mage pet Reclaim / Resummon / out DPS Level 1-39 and 39+

[Auuken]

Given the 2011 exp pet patch 'pet does 50%+ it takes 50% of the xp':

I hear that post 39 it's best to chain summon pet and nuke at 1-5%.. or something like that

But i'm confused about 1-39, should I be trying to outdps my fire pet (easy at low levels since their dmg is mostly DS) OR should I be reclaiming and nuking?

Any advice is appreciated, i'm pretty confused on this one.