ConvertToYV12 interlaced=true or false on hybrid video

[sKRUVEN]

This is my workflow, AVCHD 1080i files and I edit them with Adobe Premiere cs5 and then I export them with Lagarith as interlaced and colorspace set to RGB. The thing is that I use premiere for 50% slowmo so everything I have used slowmo on is not interlaced in the lagarith file so im getting a hybrid video (around 5% is in slowmo).
This is the script im using.
AVISource("C:\clip.avi")
ConvertToYV12(interlaced=true, matrix="Rec709")
AssumeTFF()
interp=nnedi2(field=-1)
TDeint(mode=0, cthresh=8, full=false, edeint=interp)
Spline36Resize(1280,720)
I have two questions:
1. Should I use ConvertToYV12(interlaced=true) when not everything is interlaced?
2. Does the script looks ok otherwise for a x264 720p output?

[TheSkiller]

1. Should I use ConvertToYV12(interlaced=true) when not everything is interlaced?
Yes. Otherwise the chroma would be messed up in the interlaced parts whenever there is motion.

2. Looks ok. But 720p is usually full framerate (50p/60p). Mode=1 in TDeint does full rate/double rate deinterlacing.