If tone is in your hands than I should....

I agree with Ben, the string gauge should not make a huge difference between cutting through or not, unless it's drastically heavy or light.  .010s and .011s are very close in tone and feel with the .011s having perhaps a little more bass.

If you are having a hard time cutting through even though you say you sounded "thin and bright" you can make some EQ changes.  I don't have a whole lot of experience with  the Jubilee Marshalls and maybe Ben, Alex, or even Joe could chime in here.  BUT, for almost all of the other Marshall models I run the EQ like this:  treble and presense very low or off depending on the amp, mids at 9 o'clock or dimed, and bass at noon at least (again depends on the amp).  Marshalls, especially with V30s, can be a little buzzy and bright sometimes.

Furthermore, some pedals might help you punch through the mix.  I love a good ole fashion TS808 or simiar midrange heavy overdrive that tightens the bass and drives the mids hard.  To prevent things from getting brighter I usually run the level of the tubescreamer at about 3/4, the gain about 1/4, and the tone rolled back about 1/3.

Hope this helps,

   -Justin

Hi
    As I have commented before the Jubilee is a great sounding amp  but in a band situation struggles to cut through , especially with 2 guitars. pair with a dumble clone and your problem is beautifully solved . or for cheaper option try a Boss GE-7 set as a mids boost for solos.
                             DEREK

"Everybody's entitled to my opinion.

Hi,

Derek, Justin and Ben have said all. Maybe I can add something.
I personally have a tad more mids (2 o'clock) and the gain pretty low
on 4 o'clock (still enough juice!). Also I dial the master volume quiet high (as possible)
and the gain volume at 12 oclock. I find it more dynamic and cuts better through.
The gain pot is quiet a strange bird at the ceriatone 2550. If you go below 4 o'clock
then the signal goes quieter instaed decreasing the gain. I think with some more tweaking
you will find the right spot.

Have you tweaked with the pu height?
If lower them then the trebly edge should get more balanced.

Good luck
Alex

I have one and funnily enough I am just about to sell it . they are ok as a clean boost which takes the sound you have and boosts it, pretty transparent too ,sounds better with single coils IMO . the distortion side is ok but if you have a 2553 jube then you dont need distortion of any kind. also earlier you said you use vox tone lab for effects this is probably sucking your tone bigtime, invest in a boss dd3 and boss rv5 and put them in your effects loop of the jube

Derek

"Everybody's entitled to my opinion.