Up Down Buck converter recommendations

[imk]

Hello,
So i have a few projects on the go the require an up/down buck converter, one for example is a 12 volt power source for a telescope.
Currently i power the scope from a 3S lipo or a 12v lead acid, problem is the voltage range is quite wide depending on battery state of charge.

i shopped about a found a small up/down DC-DC buck/boost module AT30 off eb that seems to work fairly well for ~12v input 12v output.
Although on varying loads the V out regulations seems poor varying as much as 0.8 V on varying load of 0A to 0.2A
I would also like to use this AT30 or similar to drive logic and MC's 3.3/5v, but I find on power off from a 12v input the the output spikes so high it's going to kill logic..

So i googled about and found what seems like a much better up/down buck board the Dps3806 by MingHe but found a review that says it also has big over shoot issue on power down.

Any recommendations please for a up/down buck board that i can use for a wide range of project eg 3v to 30v output from a most likely 12v battery source.
Many thanks imk