I've never even been to an indoor race and I have little data to base any observations on, but I see some things that I wonder about.
First off, the LR is only carrying 33 1/2 percent of the total weight. I have no idea if this means the LR is pinned down but it is certainly a much lower percentage than dirt LTO karts carry. LTO karts, on dirt, usually carry 3 to 4 times that percentage. I have no idea if that's good or bad. Indoor racing is a lot different than outdoor dirt racing.
You say the kart is pushing and then you say it's skating. In this context I'm not sure what you're saying. But that could be because of my inexperience. Skating, by the definition in my head, means sliding. You may be saying something else.
What is the minimum kart/driver weight? If the reason for your inquiry is you feel like your to slow, that big weight disadvantage could have a lot to do with it. If you look at the difference between fast times it other weight brackets you can see how much that weight is hurting you. For instance, if there is a 360 pound class and a 400 pound class, compare the difference in fast times. This should give you an idea of how much that 75 pounds extra is hurting you.
From the desk of Al Nunley
Comments compliments criticisms and questions always welcome.
If the data does not support the theory, get a new theory. (Al Nunley)