You said you were playing this as a money position, 5 euros per point, yes ?
There are 2 reasons you'll get crushed: first, the gammons are all one-way, dorbel almost never gets gammoned while you rate to get gammoned quite a lot. It's true your timing is perfect for a backgame, but the 2-4 is one of the least desireable to play.
More importantly, and I don't expect you to know this since you aren't a regular money player, in a DROP/TAKE money proposition, the DROP side, dorbel, should pay the TAKE side 1 point to take a 2 cube. This is standard and it's done to equalize the 3-1 guideline of any cube decision. In other words, you would lose 1 point for every non-gammon loss you take while dorbel loses 3 for every non-gammon loss he incurs.
Since you didn't mention this, I'm making the assumption that dorbel never offered it. If you feel you must play it out, go right ahead, my guess is you'll catch on to how bad your side of things is in just a few games.