hm, lets see first of all I'd be hard pressed to find a boa I did not like, but where are you starting your red saddle count from? all the way down the tail to the very tip? or actual saddles? Also I know you're talking Colombians but take for example a classic suriname with a low saddle count, but the large area rich red saddles. I'm a real big fan of pattern abberancies, so maybe I'll throw things off, but something like, bear with me, not really red but a pearlescent from Jeff Ronne where I would consider that nice long tail stripe a red saddle (if it were red). Or take the amarali's (brazilians especially) whose bare patterns and low saddle counts make for a striking constrast between the grey to just that little bit of bright red is just beautiful.
I also might be partial but I love my little girls tail
sorry this was a little all over the place, just examples how you can't really count by saddle number, I'm also tired and not thinking straight. But I'm sorry if this doesn't help whatever project you're working on if thats what it is.