The Albaze 1's work well in the GI, 3's work well under plastics depending on the color. I used a lot of flat top whites in my GI on EATPM, some colored 3's and sprinkled in some colored 1's with the 3's under some plastics to match the colors of the plastics and it looks nice. PBL does make the LED flashers too. Color match the inserts if your doing them also.

A few 1's with 3's depending on what pin and where there located works well, at least in my case. But here, everyone's opinion matters and should be taken into consideration.

It kind of depends on the game. I'm not real familiar with JP. Just giving some input as to what has worked for me. I think they disperse light very well IMO. I did some trial and error. Get some some sample packs from PBL and add a couple 1's and 3's to see what might work better. Depends on how bright you want it too. I do not like the concave. Most lighting under the playfield (inserts), I would go 3's and match the color.

Never used them as spotlights, i'm sure they'd do fine. What bulbs are they?

The Ablaze 3 blues look very nice. For the prices, you can't beat them.

I would then try the 555 wedge Ablaze 3's in the color you want. 4's may be a bit too much, BUT, if you ever get some 4's like I did, and they were a bit too bright in some spots, there is a way to tone them down I discovered.