On my BTTF, I've got two issues with the drop targets - not dropping when struck hard, and frequently bouncing the ball into the air (often into the glass). Anybody had these issues and found a remedy?

The targets drop very easily and quickly when pressed by hand, but probably 80% of hard hits they just stay up. They need a soft hit to drop.
I haven't found many ideas for remedies. Some people sand off part of the plastic lip that keeps the target up. I've seen one person say that the kind of drop targets with 2 springs (one to pull them down, and a weaker one to pull them forward) don't have this problem. Seems like a decent idea, I might try to modify them for 2 springs.

And not every hard hit bounces the ball in the air, but many do. I don't mind airballs but the occasional glass strike concerns me.
Perhaps the targets bend so far back it gives a steep angle for the ball to bounce off of. Perhaps shifting the targets back a bit so they hit the back edge of the playfield hole sooner would help? This would probably make the bricking worse though. Also not sure how I'd move them without drilling new mounting holes in the assembly and playfield.
Maybe a thicker rubber behind? Mine does need to be replaced anyway, perhaps I can try that first.

My BTTF had a non-volatile RAM chip installed when I bought it. However, once on a while when I power it up, it says there's a memory error and has me open the coin door. It then resets everything to factory defaults.

I reseated the NVRAM several times assuming there might have been some oxidization on one of the pins, but it still happened after that. I couldn't see any evidence of corrosion or damage on the battery holder or the PCB, but perhaps I didn't look hard enough.

Anybody had similar issues? I might just buy a new NVRAM and see if that solves it.

Looks like a RAMTRON FM16W08-SG on an ordinary TSSOP breakout board.
Nevermind the bent pin, that was my fault when taking it out.

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I'll pick one up, thanks!