Okay know imbue the piece normaly any resist over 13 counts as imbue stat but when u do it this way it doesnt.
This statement is a little misleading, but I think I know what you mean. I think a less ambiguous way to say this would be: As long as you are crafting with a regular sewing kit it doesn't matter what your total is in a resist, it won't increase your imbue total as long as you are crafting with regular materal.
There are a couple of factors in play when you craft a piece. When you have 100 arms lore and craft exceptional armor there are 20 randomly placed resist points ranging in intensity from 0 to 12 (which I understand is the limit, but have never independantly verified).
Each item type has a base resist pattern. For leather armor, it is 2/4/3/3/3. Just crafting with normal leather you could get a peice that was up to 15 in poison or in energy resist based on how the 20 random points are distributed, just as you suggest. Barbed leather adds 2/1/2/3/4, so if you are crafting from barbed leather with a normal kit your min/max for poison and energy are 6/18 and 7/19. Although it is unlikely that you will get these in one and even less so in both, it is possible for the minimum. I find its easier to get the minimum than the maximum and I see double minimum resist peices a lot. There is also an imbue multiplier associated with special materials.
If you are adding a resist, it starts adding the possible 15 imbue points from the base item resists, wiping out any points you may have on the peice from crafting it exceptionally, and any that may have been added by a special material.
When you imbue on a peice with special material the imbue system starts multiplying the imbue intensity points toward the 500 maximum (450 for non-exceptional) by the multiple for the material. This means if you are imbuing on a barbed peice, while you still have 5 properties you can apply, the total imbue intensity available is limited to about 416.5. As a result, the best peices you can imbue are made by retaining as many of the exceptional points as possible on something crafted with normal material, completing 500 points of imbue, and then enhancing. This can give you a peice with up to 600 imbue intensity points based on the possible 500 points you can add multiplied by the material multiplier. As has already been mentioned in this thread, this can be a huge pain in the butt and very costly.
I find that really good peices can be made by putting one imbue resist on a peice crafted starting with barbed, just as you have said, and looking for a peice that has no (or very few) of the exceptional points on the resist I want to imbue. It won't be the ueber elite you can make by enhancing after you complete the imbue, but its still pretty great.
Hope this is helpful!
-P