ps: I used 250000 iterations to be the most accurate possible and i dont know why haste sims high like that i have 3339 Haste ( 10.27% ) and i heard 1800 was the cap ..
You can combine your weights like that, but it puts a lot more emphasis on your aoe weights. Of course it's up to you how important the different scenarios are to you, but the way you done it now make aoe scenario roughly 3 times as valuable as the single target scenario. Some people could argue that single target is more valuable than that. In that case you should either multiple your single target weights or divide your aoe weights by something. Or use the normalized weights if you want both to be equally important.
PS. There's no haste cap at 1800 that you should worry about.