I still don't exactly know what you're cutting but it sounds like "L"-shaped extrusions?
If they are, set up is going to be trickier with a guide rail but can certainly be done more than one way. Try not to clamp the work on both sides of the blade.
I would have the saw fully plunged and play with the motor speed. Chances are good that you don't want it turned up all the way, but maybe it works better. I would set up so full plunge can be made because less of the blade is cutting the work and it should run cooler and easier.
My experience with aluminum is that it is a great heat sink so tooling doesn't tend to be the hot element in the cutting consortium. I've never had to use a cooling medium cutting aluminum. Steel is a different matter...
Just make sure, (as always), that you are cutting and not dwelling. If the saw speed is too high and the feed rate is too low, you will be dwelling. The cuttings remove heat from the blade. If the blade is dull or otherwise compromised, you will be dwelling. If you are not making good cuttings in any milling process, including drilling, you are dwelling and likely damaging the cutting tool. That includes softer materials.
I first learned that when I was a kid, a real kid - about 9 or 10. My father handed me his cool drill, (1-speed corded), and asked if I wanted to drill the next hole. Naturally I did, so he let me. We were drilling a piece of angle iron several times for mounting. When I drilled, not much happened except some little chunks. He said to push harder. I did to the best of my ability and then something burned me. I hesitated.
My dad snatched the drill from my hands and said I was dulling the bit. He finished the hole and made nice shavings the whole way.
Then, he pointed out the difference in the shavings he made and the chunks or squeaking noises that I made and explained the whole thing to me. I never forgot it.
Another thing I've learned is not to wear flip flops.
Tom