"usually tend" is a perfectly valid phrase in written English.
You can use it to express the idea that something regularly or habitually happens. For example, "Mice usually tend to stay away from humans."
"I usually tend to play the harder tournaments and the harder golf courses.
Those two types don't usually tend to be in the same person.
They don't usually tend to back down because someone has a private conversation.
These days, pop stars of West's commercial stature usually tend to bland professionalism.
The frozen usually tend to be less stodgy, especially if defrosted slowly in the refrigerator.
The English usually tend to regard the Scots as their slightly prickly but relatively harmless northern cousins.
Security is even more intense for the party planners who usually tend to the quiet dinner parties of Park Avenue.
Arguments usually tend towards the human rights records of the governments in countries where universities go to set up their international campuses.
"My work will have more spontaneity because you realize how short time is," said Ms. Rubel, whose paintings usually tend toward traditional streetscapes and landscapes.
The one that operates an arbitrary radio-controlled car that's left constantly switched on, even though TV-style remote controls don't usually tend to operate radio-controlled toys.
This is because couples usually tend to be well matched in the looks department, and it attracts attention when they're not.
