OK think probally better to start from scratch on arms, legs, and gloves. if i'm not mistaken u need 50 lrc(for 100) and another 5 lmc(for 40).assuming u have gm arms lore. u will want to make peices where the exceptional bonus and arms lore bonus falls only in 2 or 3 slots(preferably). leather has a base property of 2/4/3/3/3.
so ur resists would look like this 26/35/47/31/59(just using the base property bonus). so when ur looking for armor peices, u will be looking to see where the exceptional and arms lore bonus falls. u can get a total possible amount of 60(but ur unlikely to keep all after u imbue). Now u will be able to imbue up to 45 resist in any area(15 resists x 3 pieces).
As u can see u will need an additional amount of resists
70-26= 44 phys needed(3 imbue slots)
70-35=35 fire needed(3 imbue slots)
70-47=23 cold needed(2 imbue slots)
70-31=39 poison needed(3 imbue slots)
70-59=11 energy needed(1 imbue slot)
u will require and additional 4 imbue slots for lrc and lmc. so total number of slots needed would be 16(3+3+2+3+2+4).u have 15 total imbue slots available(5 X the 3 peices).
now when ur looking for where the exceptional and arms lore bonus falls, u will be looking to free up imbue slots. for example i would be looking for peices
with +14 phys,+5 fire,+8 cold,+9 poison, or +11 energy(in addition to base resist),or a combination(such as +8 cold and +9 poison on one piece),as that would automatically free up 1 or more slots (u can also look for total amounts of the 3 pieces combined, though this can be a good bit more confusing).
so i would be looking for peices that have high fire, cold, and poison mostly. u need only fee up 1 imbue slot to get the suit u wanted, however the more imbue slots u free up the more other things u can add(mr for example).
U can also make these out of special material(barbed or horned, wouldn't use spined). just add the material bonus to the base property. now doing it this way is abit more complicated and there r several ways to go about doing it.
if u want more info on using special material(or clarification on above) just say so, will check post again in a day or so.
note: this is mostly the easy way and maybe not the best possible way of imbuing armor pieces