Let me preface this by saying I have been using SWX ever since it came out in 1995. With that said SWX2107 SP1.0 and SP2.0 have been the worst I have EVER encountered!! Other folks might not have the same opinion, but then we are all entitled to our own opinions. I had to completely stop using SWX2017 and reconstruct all our new development we were working on in SWX2016. We are still using 2016, though I am optimistic about SWX2017 SP3.0 which just came out.
Since you have files in 2017 your best bet is to install SP3.0 and hope that its improvements are enough to keep you from being crippled.
I have been testing SP3 and it looks very stable. The issue with the application slow loading looks to have been solved, and of course it is looks more directly compatible with PDM 2017.
Even though it is a supported solution, our using SW2016-SP5 with PDM2017 has thrown up some odd behaviour no-one (including our VAR) has ever seen before.
Am recommending to company goes 2017-SP3 as soon as.