#11 - Like the RF design but would like to see the "root and Foundry" more like #3. In general the layout of #3 I like the best. #6 RF is too fancy. Like more rugged RF. like #8, #3, #11 Favorites so far are #8, #4, #11, #3. #3 - could you incorporate F with the R. There is another company that uses just R for symbol and I don't want to send mixed messages.
about #3 - if you look at the grey part of the letter R you will see that its a letter F .. its designed to incorporate both letters in one symbol.. I have switched the colors and altered the shape a bit so the F part is now easy to see because its the darker color - #33