your connection has been solid for 15 days so better trying to avoid any resets and hopefully DLM will move your speed nearer attainable although can take another few weeks
check mybt but I think it will still show infinity 2
then just maintain connection and avoid manual resets
there is nothing mods can do only an engineer visit and a DLM reset will help apart from waiting for DLM to automatically adjust your conenction speed
engineer would need to find and fix a problem before doing DLM reset