Haha easy, they aren't risers, they're shock pads. They're soft and help absorb some of the vibration when you cruise in rough areas.
The shock pads barely give any height, when they squish out some they barely give an 1/8 of an inch I think, I just wanna use the shock pads mainly to soften the pop and clunk of the board. Idk I like it better cause the clunk loud sounds of my board make me feel like the boards too stiff and hard.
I ride lows cause they help me pop better. Everyone's different. Some people like that tall distance of the tip of the tail to the ground cause they need that feel in their pop but me, I like the quickness of the tail tapping the ground, I think cause I rely more on my front foot sliding up more than how hard I pop cause my right foot/leg probably reacts faster than my left.
I would say Indy lows are like a mm or 2 lower than thunder 147/145 hi and the shock pads with the Indy lows just make them almost thunder hi height
Last thing, the Indy low feel more stable cause I feel the standard tall indy's pivot stem is what makes them feel unstable to me. Yeah it helps indy's turn faster than the stage 10 predecessor but the cost of a quicker deeper turn has to mean a loss in stability. So yeah. I like the feel of lows. And shock pads help soften the harsh streets.