Long expouser Panorama and a Question for Measuring...

Which kind of Filter are you prefer?

I started with Lee Filters especially with the Lee Big stopper.... (The worst piece of Glas I have ever used)
My had such a big blue color cast. ( Of course it's possible to handle but not a good solution for me)
I banned mine out of my bag and bought something new the Format Hitech Firecrest ND 4.8 and a Lensinghouse 3.3.
And both are still neutral! So I'm lucky...
How do you measure your long exposures?
I use a hand held meter with a spot meter function but I'm not got in metering, I have to try it more than two times to get my result.
May do you have some tips for measuring especially with a Sekonic 758?