"Backing" questions

[Zybomb]

One of the dealers at a few of the spots I regularly play at consistently lets me know about new (and good) games goin on in the area. Yesterday he told me a spot in ****** (the downside like a 30 minute drive plus a toll to get to) that was spreading a crazy deep stack 5-5 game . Buy in was $1000 min and $5000 max. The average buy in was $3k from what he told me.

Average PFR was $50-$60 during the normal parts but he said after 7 or 8 AM when theres a lot of extra $$$ on the table it started to become $100, $150 and $200. Said that there was roughly 30G's on the table durin the night and early morning hours and then close to $80k in the morning. Supposed to be a lot of lose players and an action table.

ANYWAY the game sounds super tempting, but the stakes are a little high for me. I knew him and some other dealers regularly "took action" on some other players so I asked if he'd be interested in taking some action from me. He immediately agreed (Im a proven winner and he knows I can beat the game long run).

How the action usually works is that it basically cuts the stakes in half for the player, so rather than being "backed" where the entire buy in is given by the backer, "taking action" would be where half the buy in was paid for by the backer and half by the backee (thus it gives the illusion of playing for half the stakes).

My question is what is a fair deal for this in terms of money split? It seems to be standard that when taking action on a player since the buy in is split the profits are as well -- but that seems kind of weird since Im the one playing and if I was to be completely backed (no investment at all on my part) wouldn't it normally work that way? (im assuming cash games would work the same as tournies)

If 50/50 isnt a good split what is? 60/40? 65/35? What if I have a losing session but return with $$$ (For instance I buy in for $3k, 1500 from me and 1500 from him and I cash out at the end of the night 2k -- thus im down 1k. Do I still split that 60/40 or jus chop evenly?)

Is it unethical (not that I really care but...) to give action on myself the first say 2 times, and then if im killing the game and become comfortable stop and go on my own after that?