I have to agree that weight really becomes an issue if you try to pack it all on and then go immediately into a tour with defined distances. We also toured fully loaded, very heavy, for 3 years. At the start, 60km a day was plenty. At the end, 100-120km was no problem. We also went up and down mountains, just more slowly than lightly loaded folks. The trade off for our slow speed was the fact that we had everything we needed to keep us happy in all circumstances. We could tent in bad weather and make a meal anywhere, which allowed us to keep the budget under control. The true cost of ultralight touring is the extra expense you will incur. It might still be the best solution for you, but do realise that there's a trade-off.