Ahaid, I've mentioned the authorized dealer previously. Please scroll through (Sorry I've not indexed the thread yet, never knew it's going to progress so fast). Secondly, my take on your query:
That's a lot of Highway/Motorway travelling. And those are quite some speeds (Please drive within specified speed limits, the higher the speeds, the more difficult it becomes to control a vehicle). Theoretically speaking, the profile of your tyres exudes adequate contact with surface area and are good enough for a nice grip with the asphalt. That comparatively smaller height of the side wall also means more road feedback and steering response specially around the corners. But the brand/type/manufacturing quality and health of tyres is altogether another ball game. All or most tyres with that profile will never necessarily guarantee safety, road grip, fuel efficiency and comfort alike. Else one brand/specific series of tyres would not be outperforming another. Rule of the thumb in general is you get what you pay for. In your case, Dunlop LM703, the successor to LM702 is a tyre that is Asia-oriented. While it MAY handle the load and temperature ratings, constant or extended driving at high speeds is a concern. There are much better options out there but all depends upon the budget and your requirement. Personal Opinion? I don't think Dunlop LM703 is preferable for 90% of Motorway use at speeds ranging between 170 to 190 KMPH. And remember, we usually tend to spend more on alloy wheels / rims and don't give too much importance to tyres whereas it should have been the other way round. Remember, at those speeds, you and the asphalt are separated by approx.6" of height with approx. 1 foot worth contact:surface area. Invest well.
Let's face it, these guys usually take precedence over tyres when both have to replaced/changes or upgraded. Why shouldn't they? After all, its the rims alone that make a world of difference in our rides. However, in their selection, again, styling or design takes precedence over material, R&D, correct specifications for a proper fit and quality to ensure consistent and flawless performance as advertised. Not all light weight alloy wheels are created equal. Then, for some vehicles light weight wheels might not be suitable. But as a rule of thumb light weight wheels coupled with rubber is a package that can make or break your ride (and the wallet as well). You may not require an Ultra High Performance Tyre wrapped around an Ultra Light Weight Alloy Wheel. So be very clear in your approach keeping in view your budget, requirements and safety in mind. The alloy wheel in your case is a fake replica, the performance and consistency of which cannot be trusted. Rest, Almighty Allah is the most powerful of all. May He keep us safe.