However, I'm running into difficulty finding banks that will do HELOC's on investment properties. 

Or get a personal line of credit at your bank?

Is this as simple as providing a bank statement from the hard money lender?

Example:  you purchase the property for $400k with 80% loan to the value/ purchase price. so the loan is $320k and the 80k is the down payment you had to put as the remaining 20%.After 2 years the  house is gone up in value to $500k, now you can go to different bank and ask them to give you 80% of the new value of $500k. 80% of 500k is $400k. so the new Bank say yes to refinancing the existing loan to new loan of $400k.  

My local banks amortize commercial loans over 15 years, not 30, and that makes a big difference.

You’ll need a new insurance policy with the llc as insured, this is what normally alerts the bank to the transfer.

Would there be a better chance the banks will help me. 

Make a little now with a "line of credit" for next one at lower than bank rate.

If you want to buy investments, contact a local/regional bank or credit union they will likely have the best offerings for you in the long run.

You should have enough equity 40-50% LTV that some bank will give you a loan at that point.