Buying multiple homes without destroying credit score

[Aaron Murphy]

I am planning to buy between 4 and 6 properties using conventional investment financing 20-25 percent down fannie mae confirming loans over the next 12-15 months. 

I just completed a refinance as a prelude to that and I will be purchasing a house hack within the next several months prior to this plan as well. As expected I noticed that my credit score took a hit 8-11 points following the refi. 

I am now concerned that every time i buy a property as i carry out this plan ill take another 8-11 point hit wich could lead to losing almost 100 points over the course of the plan. I understand that if i buy the properties with the same lender and within a 90 day period i wont take multiple credit hits but is there any other way to avoid this problem? 

I have been searching online around this issue and haven't found much that is helpful. Thanks in advance everyone.