If you are looking for the fastest way to be together in the USA, keep with the K1. Idk why anyone would advise otherwise or for that matter suggest the CR1 is better/faster/even close to the same speed - IT IS NOT. Just browse around the forums here, FB and other places then you will see there are CR1 4-5 years in the process, which you're mostly never going to find with the K1. Every situation is different so take these as my opinions, but my fiance and I were faced with this same choice 1 1/2 years ago and I'm very glad we chose the K1 route.
On the waiting portion, just focus on WHY you started the process, STAY POSITIVE, and when you start feeling crazy waiting, talk through it or find something to take your mind off of it. I found that it was helpful to just forget about it for months at a time and focus on laughing with my girl from afar. But whatever you do, try not to let doubts/worry/negative creep in.
At 8 months in you're still about half way or less into the journey. It will be another 8 months or so before you get NOA2, pass through NVC and schedule the Medical and Visa interview. Medical is a hurdle in and of itself to pass through as 1 in 7 patients are pinged for Sputum and need at minimum 2 months to wait those results, and more for treatment if Sputum samples come back positive. After the interview you will wait again to get the passport back, and only after that the last interview can be scheduled which is CFO. CFO is required to leave the Pi with a K1.
Stay strong, stay positive and remember why you started this journey.
LIFE IS SHORT AND TIME GOES BY FAST - so too will these processes once they are complete.