low pressure on hot side of new kitchen faucet?

I see this a lot...did you flush the home plumbing water lines before attaching the supply hoses from the shutoff valves to the faucet?

You probably have some very tiny bits of crud in the cartridge hot side which is causing the low flow. Anytime you shutoff the water valves and then reopen them after installing a new faucet, you take a chance of tiny bits of loosened debris in the piping elbows, etc.. clogging the faucet/cartridge orifices.

The proper method is to attach a length of supply hose to the shutoff valves and open them/run the water for a minute or so into a bucket to clear any debris in the lines before attaching the lines from the shutoff valves to the faucet.

You can try to backflush the faucet to blow out any crud in the cartridge or orifices in the faucet...remove the aerator tip of the faucet and place a dime or piece of thick paper cut to size under the screen to block the flow of water from the faucet head ...reinstall the aerator for now and tighten as best you can...attach the cold water supply hose to the proper port on the faucet and cold water shutoff valve ... then attach the hot side supply hose to the faucet port but leave it disconnected at the shutoff valve end. Point the hot side hose from the faucet into a bucket and slowly open the cold side shutoff valve...start with the faucet handle at full hot position ...then operate the faucet handle to full cold and full hot positions back and forth a few times .....the incoming cold water should force any crud in the cartridge orifices to flow back down the hot side supply hose into the bucket.

Then turn off the cold side shutoff valve, remove the dime or paper from the aerator and reinstall aerator as usual, attach a supply hose to the hot side shutoff valve and open valve/let the water run into a bucket for a minute or so to clear any other debris in the lines...then close hot side valve and reattach the hot side hose from the faucet to the shutoff valve...retry faucet.

You may have to disassemble the sprayer head to clean any debris in it....or remove the spray head and place the head under another sink faucet to force water in reverse direction of flow to clear out any debris....reattach spray head and retry.

If backflushing does not help, you'd have to disassemble the faucet and clean any tiny bits of debris from the cartridge orifices.

The Soltura.

I'd have to blame the cartridge, unless there's any screen in the incoming hot side of the faucet that could be clogged.

Sounds like you already found the solution from the last one. Maybe just get your money back and buy a different faucet, that one seems to be troublesome.

Nah, couldn't be the water heater, if you switch the cold supply to the hot port on the faucet its still low pressure. I think its the faucet.

I see the link for your new faucet includes American Standard, who've made some good stuff over the years - but then that name doesn't come up on the page, perhaps suggesting an interesting "Made In...." line.

Meanwhile - Your swapping hot & cold supply lines was ingenious, and clearly indicates the problem is in the faucet itself. At the least, if you really want the sexy thing, contact the manufacturer's customer or tech support, in case you've missed something. The "memory position valving that provides water at your preferred temperature" gives me pause, as I have no friggin' idea what that involves, but they do.

Being a old guy, I like simpler stuff that's built like a brick and easy to maintain. (Sexy sometimes just means high maintenance?) Hang in there, you'll figure it out.

American Standard Kitchen Faucet Cartridge

This happened to me at my new apartment and I had to get a new water heater. It was apparently like 15 years old. After the new one was put in we haven't had any problems. Your faucet is probably fine. Get someone to check your water heater.