I use a Hobonichi techo planner and grid notebooks. I also use Midori grid notebooks. No feathering on both, not too glossy so my nib doesn't "skate" on top. I like Rhodia pads (some of the notebooks feather). Clairfontaine is lovely smooth paper but my pens usually "skate" on it and I can't control my handwriting on it, but YMMV.

Sailor and Platinum converters are easily disassembled/reassembled.Try it :)