I'm curious if this uptick is due to many investors being involved in hard money loans and now facing the need to refinance, unexpectedly encountering significantly higher interest rates compared to a few years back.

On the rental side, say you take a loan on 150k (75% LTV) at 7.5% rate.

Are DSCR loans on motre than 4 units possible with no seasoning of DP? 

The 15% DP is financed through our private money lender. 1 year loan ($150k) at 5%.

However, rents keep increasing and, assuming you get fixed rate loan, your p&i is fixed.  

Also what do I need to get a loan?

They offer unsecure loans, not using any collateral. 

We found a property that we like a lot and was getting ready to pull the trigger on it but wanted to know what would be the best strategy for us without going the conventional loan way or FHA way due to having to; 1-having to put down 20% for conventional and 2-having to live in the property for a minimum of 1 year with the FHA.

This, I feel, is the least you could do in a subto deal if the loan remains in the seller's name. 

I know several lenders that'll do a loan in your LLC, but it'll be a debt service coverage, ratio loan or dscr.