Building an LPad attenuator

Hey guys, I built a stupid little L Pad attenuator basically like the one here. http://guitarprojects.weebly.com/diy-attenuator.html
the only difference in the circuit being that I used an 100 watt 8ohm lpad. It works but here's the thing, I really only get any attenuation in the last 1/8th of a turn on the dial. And then it comes on really fast and I can't really get any use out of it. Is this normal? I wouldn't think so. I have used it with a 4 watt amp, a 5e3, 5e3x2 and all the same result. Is this because I'm not running enough juice through it? Or is the problem somewhere else? Or should I just throw it in the garbage and build something else in the enclosure? lol Also, the bright switch is barely noticeable, if at all. hmmmm... Funny, I've built a few amps and made them work pretty easily. But this is making my head ache a bit.

Oops never mind delete

Ideas : http://farm7.static.flickr.com/6178/6134361780_5c32a54ccf_b.jpg
http://farm7.static.flickr.com/6161/6133992197_297b68e436_b.jpg
Or best :
http://farm8.staticflickr.com/7264/7072213321_726a817d9e_b.jpg
Curves
http://img528.imageshack.us/img528/2862/r8ohm.png
http://img641.imageshack.us/img641/5640/db8ohm.png

Copyright myself (Kleuck) 2012, private non-commercial use only.

thanks for the responses. Funny after the 3rd time searching in this forum I ended up finding some more answers after changing some search parameters. I DO try to search before asking, on numerous forums and of course google... etc... Thanks for the info.

how much current do you think those .22 mH inductors should be rated for? Maybe thinking I'm using a 40 watt amp. Most times it will be a lesser powered amp, but I would like to try it on my 40 watter?

It's all about current, so depends on your cab's impedance.
I actually use now ,33 mH chokes, but a single .5 to 1 would work, my little box (this one is small) just can't accommodate a larger one, and it's for a low power amp (<<10 watts)

3 different 8 ohm amps some combos some paired with an 8 ohm 2x12 cab. Ranging from 16 watts, 20 watts, 25watts, and 40 watts. But I mainly want it for the 25 and 40 watter. I'm using a 100 watt 8 ohm lpad now and am planning on adding the rest of the circuit above to it. Should I shoot for 3 amps to accomodate for the 40 watter?

4 A for 100 watts.
But wait, the L-Pad are not at all able to handle 100 watts, beware !
I do not use them for more than 30 watts.
Go for the last schematic, with a rheostat : the rheostat has to handle only 1/4 of the power, same for the self.