Originally I was considering well-thought out advice that said to dump those, but after a lot of reflection I found out that they actually mean a lot to me so those aren't dispensable.
I don't know what else to advise. I have the same set as you do. I built a set around Cain's as well and it just didn't work as well as the other one. That's why I listed those items rather than a set based around Cain's. More dps = more XP and then you want to work on some Hellfire rings and maybe try to farm Leoric's. You're also staying in Act 1 MP0 when it's more efficient to play Act 3. I used to do A1 MP0 back in 1.0.4 with Cain's set b/c it was 30-32mil exp an hour but in 1.0.5, with how cheap gear is nowadays, you can actually get more than that so it doesn't make any sense to stay in A1 anymore unless you are Hardcore mode.
Like other people said, you were given good advice but you refuse to budge. You refuse to give up GF and pickup radius, and Cain's set. You're not going to get anywhere because you reject all advice given to you.
If you really want the pickup achievement, do what I do, play a Tempest Rush Monk with 375GF and farm Hell mode for 600,000 per hour. You're not going to get anywhere gold finding with a Demon Hunter, trust me, I tried. You cannot beat a TR Monk on GF. Most of my GF gear was self found and only pieces I had to buy were Xephirians, rings and blues for follower.
If you were farming A3, you could be saving a ton of money by finding your own GF/pickup radius gear, but you can't find them because you also rejected farming A3 since you won't move from A1.
I don't know what anyone else can tell you and how you can expect people to respond. There's nothing left to say, or advise. You have no further options available.