I would like to know more, since you imply that they never do well...
For starters, how long do you get those temps?
Also, what is your growing set-up?
In general, from what you said,
I would make sure I have them in a good amount of standing water.
(How much do they sit in currently?)
Perhaps increasing the water level might help.
Also, I might use shade cloth like for the Neps.
(Perhaps an either/or experiment.)
If there is a way you can cover the containers that hold the water,
like burying the container so it isn't sitting there cooking the water in the sun.
Some way to keep the water cooler may help, but then possibly just increasing the water level itself may be enough.
If what you are doing isn't working, why keep doing it? Try changing things a little at a time,
and watch the plants response. Indeed a picture may help. Until then, a better description of what the plants are doing may provide a lead.
Also, to know if it is not something else... information about what growing media you are using, what type of water, etc. It is hard to make a diagnosis with only "never had much luck " and " my plants look terrible".
If you really do want some opinions that may actually help you have success with these, then providing information will help make that possible. Otherwise, wireman pretty much covered a valid response to what little you have given us to work with.
(Just my opinion)