Hi Adam, It's Adam!
Generally speaking, dichro's reflect light with greater efficiency than they pass light. Also, you have lots of extra green. (Ideally your color mix should be 4.6:1 Red:Green.) So, if it were me, I'd choose a dichro that will reflect red and pass green. Expect to pay around $45 for it.
Have a look
here for some current prices from Edmunds. The 6th one down on the list is the one you want. (Though the 5th one will work too, it's only 5 bucks cheaper and it's HALF the size, so unless you
like dealing with small optical components, I'd go for the larger one.)
You should see better than 98 percent reflectance of your red from that one, and around 90 to 95 percent transmittance of the green. (It will also pass blue for that matter.) Pretty much anything shorter than around 590 nm is going to get through at at least 85%, and the transmittace efficiency will go up FAST beyond 590 nm. (Going the other way on the spectrum, at 615 nm the transmission is down to 50%, and at 640 nm it's at just 2%.)
Adam