Finally upgraded a month later after posting this thread (total of 4 months since Nov when modem was installed!)
Engineer said that they're converting local street boxes with Fiber (instead of copper like it is now) and we can expect higher speed plans later in the year but for now they're trying to do whatever it takes to go head on against ACT and Cherrinet. At the speed it took them to update my connection, I wouldn't be surprised if they continue to lose more customers.
I'm not so sure of stability but will update or create a new thread in the future.