I love a Gibson guitar into a Fender amp, but my EJ Strat is pretty phenomenal too.
I'm selling off a bunch of amps and cabs to fund a Cutthroat Audio Down Brownie, and I'll add that Fender brownface amps are criminally under appreciated.
Middle needs to be RWRP if you want hum canceling in the neck/middle position. What I don't know is if the SSL3 is RWRP with the split JB, so you might or might not have hum canceling in that position depending on how the JB is wound relative to the SSL3.
I'd ask over on the Duncan forums...
I have the 12F150 in my Deluxe Reverb and it is amazing. At first I didn't like it that much, but it wasn't yet broken in and I wasn't very good at getting great tone from a Deluxe Reverb. As the years have passed, it has only gotten better and as I've learned to dial in tones, it seems to...
If you have the funds, that Stapleton Princeton is absurdly good.
I love Fender amps. I have a Deluxe Reverb clone and it just loves my Les Pauls. I use a Skreddy Hybrid Fuzz Driver and I can go from sparkly clean to Dio or Iron Maiden with a twist of my volume knob. Of course, you can turn...
Also, I'm not familiar with the DSL5, but with a DSL100, I would suggest ignoring the red channel at first and work off the green channel. There are a wealth of classic Marshall tones there. If yours is a dual channel, start with the green channel first.
To simplify things a bit, I have 2 suggestions.
First, as @NotScott said, dial in less gain than you think. You want an organic tone. You can always boost it.
Second, as the gain goes up, the bass should go down. In general, the more gain you use, the less bass you'll want in the signal...
It's hard to perform live with for you. Your back is gonna hurt after an hour of playing. It is much harder for you to play fast licks on and get used to the neck.
None of those things are necessarily true for other people. Certainly not for me.
Pots and wiring look like a typical 90s Standard for sure. The serial number is bizarre. As others have said, the plate wouldn't cover a normal serial no. and it looks like yours never had one. I'd send an email to Gibson Customer Service and ask them.
The Guitar Dater Project came up with...
I should. I'm pretty lazy -- you can see I didn't bother to blow the cat hair off the top of the pedal before I took that last picture.
(Actually I didn't notice it until I posted the picture).
Anyway, I might do that if I have time this week.