I did a few tests with my sorc with both a mag and stamina setup.
for mag i was using spell strat and medusa rings and weapon with a monster set. witchmothers drink for testing
for stam i was using relequin and Briarhart with a monster set. with camoran drink for testing
race Dark Elf
dummy was atronach
for stamina there was no problem whatsoever i didn't even need to use synergy to keep up 0 heavy attacking
for magicka it was like i was constantly running dry had to heavy attack several times just to keep up magicka.
on live it seems that both magicka and stamina have about even problem keeping resources.
Am i doing something wrong or are other people experiencing this same problem?