Tier2 is 31 levels over each craft of the synth (this includes being 31 levels above on the subcrafts). This means a smithing level 127 would be needed to T2.
hq rate increases when your 20-30 over the crafting level to make the item.
back in the day. hauberk +1's would pull in money for smith crafters.
DEF:48 STR+6 DEX+6 Accuracy+12 Attack+12 Evasion-10
LV 69 WAR DRK BST
but not with abyssea pearle hauberks on the market for 15-20k.
there is no way to sustain the prices at previous levels when the majority of the player base can use the pearle. and its easy to make the required cruers. even if the hauberk had +20 evasion instead of -10.. it would be doubtful it would ever recover.
not when the higher level item has a set bonus haste that brings it up to compete with dusk armors.
DEF:61 STR+8 DEX+4 Accuracy+8Attack+8 Critical hit rate +2%Set: Haste+5%
LV 78 WAR PLD DRK BST SAM DRG
or any of the other options a warrior/drk/bst might take with +1 and +2 moggle quest gears.
the problem is you'll craft 100 of these at 300k material costs to make 1 cursed hauberk -1. and the market isn't paying 30 million.
so you will lose crafting these for 9million.. unless you can sell the normal cursed hauberks for 300k.. and in the current economy its probably closer to 30k.
being that u can get +6 STP and + double att through synergy on the adaberk, it is actually very usefull to the jobs that can use this for xhit builds.
As for the sub-craft/main craft teirs, I believe ur right. If a synth has a subcraft, it checks both sub and main for hq. So if ur less then 10 lvls on ur sub, but +31 lvls on ur main it would still be T0.