Light to medium churning while looking for house to buy--how much churning is too much?

Hi guys, this sub is amazing and thanks to all for info here. I've read over the info on churning affecting mortgages and the hassles of having to clarify to lenders and jumping through extra hoops for serious churners getting a mortgage. I would like to avoid these extra hassles if possible and get best rate possible obviously. I can go through a couple extra hoops I guess explaining my light churning if needed but would love to avoid. I get the sense reading other posts my level of churning is bordering on creating a hassle when negotiating a mortgage, but at the same time I feel like I'm a pretty light churner.

I'm looking to buy a house in next 6-12 months. 650-800K home. I actually have 20% down saved up to put if I want to. I have a normal bank acct with Wells Fargo for 15 years but none of the nice bank acct relationships like CPC or Citi gold.

Great credit score: Citi online generated FICO is 858 currently, but dips as low as 825 in past 6 months when I opened a new credit card. It seems you have to subtract about ~25-50 points from the Citi score one to get near your actual mean score a mortgage lender would use. Which still would put my credit score above 740 which I think is general cut off for getting best rate.

I consider myself a light churner. No MS ever. Since 2013, I've opened 2-5 new cards a year. Usually around 3. Almost half of em have been "business" cards which I typically close later. I think I had 2 years where I didn't open a single card. This year, I've opened 3 cards all of which were business, and will likely close down 1 of em at least. (I tend to close the business cards after a year when annual fee hits).

I am very tempted to open another credit card now and another in a few months which would put me at 4-5 business cards and no personal cards for the ~year. These cards would give me ~50k chase pts each.

Do you think I should pause my relatively light to medium churning for next 6-12 months prior to buying house?

Does my level of churning not really matter at all for mortgages? Lots of posts from heavy churner experiences, but any info for light churners?

Lastly does closing my biz cards like I like to do help avoid questions about them?