I really don't understand how no one seems to understand sales and incentives. You want to bring people to the server during less pop days/hours so that it can continue onto the times that already have high pop. Saturday is the highest pop'd day so by giving double xp on that day you are punishing players for playing during low pop by giving them less XP. These players are already dealing with just a few people on the server and now you rubbing in their face that they get less XP?
If you continue on to benefit players who were already going to play on the weekend you will see less players during the week. Less players during the week results in a more dead server causing less players to show up on the weekend. So just like any food restaurant you need to put the good deals on days the restaurant (server) is doing the worst.
I really don't see the point in this rule. If the CT drops down into the vent instead of taking the ladder, he should be on pretty equal terms with the T holding the vent. You can even flash and nade into the vent a lot easier than you can nade out of it.