More dumb VAX 11/750 questions

Hi guys, Finding this list has encouraged me to try and get some stuff together on my VAX. Sorry for the extra traffic. Q1. Right now I have a UNIBUS expansion cabinet attached to the primary 11/750 cabinet. I would like to replace it with my TU80 (with a RA82 in the lower drive bay). Can I just move the UNIBUS cards that I want to keep to the primary UNIBUS and pull the DW750 from the CPU back plane and be good? The James Lothian FAQ mentions something about reconfiguring some jumpers if you install a DW750, so I would probably need to change them back if I remove it, right? Q2. Right now I have a DEUNA, UDA50/UDA52 and DHU11 in the primary UNIBUS with those bus continuity cards installed in the open bus slots. On the secondary UNIBUS, I have the TU80 controller, another DHU11 and a DMF32. Can I just pull the bus continuity cards from the primary UNIBUS and install the TU80 controller and DMF32 in those slots? Q3. Right now the memory slots have M8750s CJs in both end slots and 6 six National Semiconductor 753 1M boards in between. Does it have to be this way? I have two spare M8750s. Are there any advantages between the DEC memory boards and the NS boards? Q4. I have a floating point option board (L0001) that is supposedly intermittently bad. Anyone know what kinds of things fail on these boards? Q5. Should I use or not use some kind of contact cleaner on the board fingers and the sockets they go in? Thanks, alan