You definitely get a lot more smoke from the tube. So, it is easy to over do it. I usually go about 5 hours with my tray and saw dust, and then 3-4 with my tube. Most will say that you should smoke until you get the color that you want, not so much the time. But, I have found when it is really cold out, I don't get as much color, but still get plenty of flavor. So, when I smoke my cheese I tend to look for a combination of color and time.
I have a batch that I went 6 hours on and it was very strong and took on a ton of color, but has been taking a lot longer of a rest to get to the sweet spot. Admittedly, I was pushing the envelope to see how far I could go. I haven't tried any in awhile, but I should probably give some a shot again to see how it tastes. I don't plan on giving up on it. It will get there.
I wouldn't worry too much about your batch. Time will really mellow the cheese out. I am pretty sure you are going to see a much difference between 3-6 months than you did from 1-3 months. And even if it isn't quite there at 6 months, don't throw it out. Let it go longer and it usually will come back.
In a perfect world, if you don't like having to wait for for a month to eat your cheese and still have the depth of flavor that you don't get with a 1-2 hour smoke, the way around this is too cool your smoke by having a smoke box with your cold smoker in it and then route a good 6' or more of tubing into your smoker. This cools the smoke prior to entering the smoker and prevents the acrid smoke from hitting the cheese which results in cheese that is pretty much ready to go out of the smoker. There are several threads about this on one of the other smoking sites. PM me if you want some interesting reading. But, I haven't bothered with this yet. I just have multiple cheese smokes where I always have some 4-8+ month cheese ready to eat. I have some aged cheddar in my fridge that is over a year old and continues to get better and better the longer I let it age.
Patience will get you there on your 5-hour smoked cheese. I am reasonably confident.