It's based on rank. Synthing a rank 1 item gives +1% condition. Rank 2 is +2%, etc etc.
It's a bit expensive now, but later on money becomes worthless and synthing for condition becomes worthwhile.
You should store excess equipment and hang on to it, though. All of it is good as fodder equipment for synthing. And if you have the cash and you find yourself using the same equipment, go ahead and start synthing; it's less work you have to do later.
That is, store the excess that you're not using for shadowgram.
It's a bit expensive now, but later on money becomes worthless and synthing for condition becomes worthwhile.
You should store excess equipment and hang on to it, though. All of it is good as fodder equipment for synthing. And if you have the cash and you find yourself using the same equipment, go ahead and start synthing; it's less work you have to do later.
That is, store the excess that you're not using for shadowgram.