What model Octavia do you have. Just curious if you have the problematic 7 speed DQ200 or the much better 6 speed DQ250. Either way, a DSG tune will help driveability but the 7 speed DQ200 has some inherent design issues which cannot be fixed.
Your 135TDI will have the better 6 speed DQ250 gearbox as these gearboxes are fitted to the TDI's and also the GTI and R Golf models (basically any front wheel drive VW/Audi/Skoda with more than about 300nm of torque).
A DSG tune will raise the RPM limit where it changes gears. For example, my 2015 Golf GTI used to change gears at about 1,800rpm, but now with the DSG tune it changes gears at about 2,200-2,300rpm. This might not sound like much, but it makes for a significant difference when driving. For example, at 60kph the car is in 4th gear at about 2,000rpm which is a perfectly reasonable gear to be in. If you need to speed up (eg get through an orange traffic light) you are within the engines torque band so you can gain speed without changing gears.
At 80kph the car is in 5th gear. It only goes into 6th gear at about 90-95kph now.
Before the DSG tune, I simply couldn't drive the car in normal D mode because of how silly the factory software was (obviously aimed around reducing noise, emissions and using less fuel) where it was in such a rush to get into the highest gear possible (at 60kph it was in 5th gear at about 1,500rpm).
So yes I would recommend a DSG tune. Plenty of places do them these days. TVS is apparently the best. But there is Revo/APR/Racingline/ IE etc. Personally I have IE (Integrated Engineering) and am very happy with it. Volksmuller at Annangrove is probably your closest IE dealer who can load the tune on for you.
As for reversing up your driveway, this is not a great situation for a dual clutch transmission and is definitely a weak point for them. The only steep driveway I go up is my parents place who have a long, straight and relatively steep driveway. But I had no issues reversing up this pre or post DSG tune (I assume because its straight I can maintain enough speed to keep the clutches engaged).
Given the issues you have mentioned (towing, stepe driveway etc) I think you would honestly be better off getting in touch with a TVS dealer as they offer multiple versions of their DSG tunes, and one of the options is called "life extender" with clutch cooling, clutch thermomanagment and improved clutch control. German Performance Garage in Castle Hill are the local TVS dealer.
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