Stack Defense to 30%, Absorb untill 50% then work on more Shielding. The 37% you are looking at has to be your Damage Reduction, which uses your Armor Rating. Your Defense is proly around 25-30%. For 1% defense you need around 25 more rating, I doubt your actually defence is 37%.
I do play a Tankassin. Im our MT over a Jugg and a Powertech. Just for a lil background on why I gave my opiions.