Tomcat did a series on washing pellets - he has won the odd competition so maybe worth a look.
https://airgun101.com/index.php/component/allvideoshare/video/sorting-pellets-part-1-washing-amp-drying?Itemid=421

Think your idea is basically correct, never go into the washing side - started weighing pellets and that has lost me many many hours.....

great vid thanks Big G - got my Mk3 WC last night - what a beauty - cant believe all that is cramed into 27"

it's a slippery slope (every pun intended).... gets very addictive if you're slightly OCD like me... first washing, then weighing.....

I'm a competitive 25m national benchrest shooter and I can honestly say pellet prep is the most important thing to do for constant accuracy. Wash them and let them dry fully. Weigh them out and sort into separate weights. For my competition pelelts I only use those in a 0.05g tolerance range. This is where things get interesting. You need to measure the headsize. Some barrels prefer different head sizes. On ny hft500 a difference of 0.01mm in head size can be the difference of a true one hole group to a ragged hole. When your trying to get a 4.5mm pellet into a 6mm 10 ring that can be a big difference. Aftwr sizing you need to do something called the yrrah roll method. Doing these steps will give you the most accurate and consistent pellets you can get for your rifle. Pellet lubricant may help it may not.