you should have 5carts per conversion, syno comes in a 10cart box. not sure where you are getting 6 grams? if i am not mistaken, each 5 carts has 10g of test (assuming you harvest all of it --which you probably will get close , but not all of it)
anyhow, each 5 carts require 3ml of estrogen solubilizer. this solution is NaHO, i think, which is lye. i recommend you get a kit from a research company. you get everything you need. go to universalkits , i use theirs all of the time and it is good stuff.
all together you are looking at around $180-200....very cheap considering a box of syno yeilds up to 6 months supply (give or take depending on dosage)