Corn adjunct issues - Hydro sample is terrible

So I tried to make a cream ale a few weeks ago and I just tasted a hydro sample. It's the first one to date I could barely stomach. All I can taste is the corn.
Can someone please take a look at my recipe and let me know if/where I went wrong and if this corn taste will subside. If it helps, I hit way high on efficiency and ended up with a higher gravity than intended, thus the high ABV. I know it's green at all, but I've never tasted a green beer this bad.

Thanks!!!

Type: All grain
Size: 3 gallons
Color: 2 HCU (~2 SRM)
Bitterness: 16 IBU
OG: 1.048 FG: 1.008
Alcohol: 5.2% v/v (4.1% w/w)
Grain:
3 lb. American 2-row
1 lb. Flaked corn
.25 lb. Flaked rice
Mash: 90% efficiency
Boil: 90 minutes
Hops:
.3 oz. Willamette (5% AA, 45 min.)
.3 oz. Cascade (6% AA, 30 min.)

I too brewed a cream ale about two weeks ago; I too have a "corn" taste to the beer. I'm not worried about it since it has only been two weeks and I've heard stories about this recipe tasting like A$$ for at least three weeks. I would just suggest that you RDWHAHB until it has been bottled for a few weeks. I only did a week in primary, thinking that I should have done three before bottling, but the taste is slowly cleaning up as I sample the bottles.

I think that's kind of a lot of corn for a three gallon batch.
I used a pound for six gallons.

Thanks for the input, guys. I tried to halve BM's cream of 3 crops with this one. I'm hoping it passes with time. That's been my experience with other off tastes, etc... I just wasn't sure about this one (I thought maybe I messed up my math or mashed too long).

To me, BM's cream taste really 'corny' and yeastie for the first couple of pulls from the keg. After that, liquid gold.

That is a lot of corn. Use less corn and more rice also I use cheap instant rice instead of flaked rice

The corn does seem a little upfront in it when it's young, but it's a pretty light beer to begin with. I use a couple of lbs of corn in my pre-pro amber lager recipe and you can't taste it at all. But then again, I'm using 6 row and the beer is lagered.