LOL! "...I use lead weights to keep it from blowing away on windy days..." If the wind tries to blow my pad away, IT IS TOO DANG WINDY TO BE FLYING, FOLKS!!! ROFLMAO!
Prop wash was my issue with DYI pads. Tried cardboard, a moderately heavy door mat. Finally gave up and spent a few extra $$ for a pad when I bought the M2.