Glock feeding problem....UPDATE Solution found
Update... 5/15/2017 =================================
After replacing the recoil spring, magazine spring, polishing the feed ramp, and installing a Wolf gun springs service pack (plunger spring, striker spring, ejector spring and trigger spring) it turns out that issue with the slide locking open after the first 3 rounds was caused by a weak slide stop spring which I promptly replaced with a new factory slide stop. It took serveral trips to the range to narrow it down. I basically have a tuned up Glock 27 now. 
*********************************************************
Good day Fellow Sig Shooters-
I have a first edition Glock 27 I purchased in 1998. Must of put over 7k rounds through it at this point.
The recoil spring was changed about 500 rounds ago to a Wolff setup. I hold it the same way, lube it the same way and basically use the
same hardball ammo for the range. I am now starting to experience a feeding issue where the round will only go half way up the feeding ramp. It
usually happens on the first 2-3 rounds off the top of magazine and I can pull back on the slide a bit and it will load the stuck round into the chamber.
I changed the magazine spring on this particular mag and tried a different mag and have the same issue with both mags.
Could it possibly be ejector related?
Any ideas would be much appreciated?
Thank you in advance!