Bread machines and low altitude my bread won't rise!

I am experienced in baking; I am 65 years old and been baking and cooking for a while, but this problem has got me going crazy.
I have recently purchased two new bread machines; one is a Sanyo brand and the other one is an Oster brand. I live below sea level, and the bread I have made in them won't bake light and airy--it bakes very dense and won't rise completely. I previously had an older bread machine and it baked perfect bread every time, but I also lived in a higher altitude when I had it.
All my ingredients are fresh and I have followed the recipes to a T. What am I doing wrong? I never had this problem before until I got these new bread machines and got rid of the old one. I am so frustrated. I'm ready to just give up and throw my bread machines away.
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Why is my bread not rising in my breadmaker?
Too little yeast, your bread won't rise sufficiently; too much, and it will rise and collapse. It's important to watch your dough as it rises and bakes; dough that has risen and collapsed may look just like dough that never rose at all, once it's baked.How do I get my bread machine bread to rise more?
The Bread Brick \u2013 the bread rose a little, but not enough: Not enough liquid \u2013 Try increasing water or milk by one to two tablespoons. Too much salt \u2013 Try decreasing salt by \xbc teaspoon. Not enough sugar \u2013 Try increasing sugar by \xbd teaspoon.Does elevation affect bread rising?
High altitude (over 3,000 feet) affects bread baking because the lower air pressure allows the yeast to rise 25 to 50 percent faster, and the drier air makes the flour drier. If the dough over-rises, the results might be a heavy, dry loaf or misshapen or collapsed loaf.Why is my breadmaker bread so dense?
Dense or heavy bread can be the result of not kneading the dough mix properly \u2013out of many reasons out there. Some of the other potential reasons could be mixing the yeast & salt together or losing your patience while baking or even not creating enough tension in the finished loaf before baking the bread.7 Common Bread Machine Mistakes That Are Easy To Avoid
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: George Milton, Klaus Nielsen, Tima Miroshnichenko, Tima Miroshnichenko