The tanks are usually where things start going south for me too. I've broken into the 300,000's on the original, and my high on the .84 MAME version is right around yours. No matter how good I'm doing, I'm usually done 1 or 2 screens past the tanks. That first screen without the border is brutal.
I've obtained the updated ROM, but haven't migrated it over to my cab yet. I installed .99 on my cab for Golden Tee 3D, and left .84 intact since that has been my main cab setup for over a year. I'll be able to play both versions back to back this way, so it should be fun to compare!