I wouldn't say you need to upgrade right away. An upgrade wouldn't be a bad idea, as previously stated (in the future)I think you may be able to tell when you're python is getting too big for the tank. If he can't fully stretch out across the tank, that's usually a good indication as well. Keep an eye on any changes in behaviour that you may notice as well.
As per the other comments; if you feel you and your BP benefit from the lamps versus the UTH with thermostat and it is indeed working for the both of you, then I suggest just adding in some damp sphagnum moss and creating a "shed box", which hopefully will help with the humidity. It is quite cheap and lasts a long time!
A temp gun is an excellent thing. If you don't want to always be opening up the lid, you can put it next to the glass at the bottom of the tank as well and I find it is quite accurate.
Just keeping in mind that there should be about a 10F difference from one side of the tank to the other with this respect (~80F one side, ~90F the other). To keep my ambient air temp up I use a 50W red bulb which stays on 24/7 and does not bother the BP's eyes - and the air lingers around 79-83F. I hope you are not turning the heat bulbs off at night! No night drops are necessary (and less than 75F is harmful).
People just suggest the UTH as snakes benefit from belly heat to digest their food. It can also be nice to not have to monitor the heat as much, as thermostats regulate that for you. However if you find your temps are accurate and your snake is eating and pooping and shedding properly, I personally don't see a problem with it.
Best of luck!
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