Last year around this time (Nov 1) I ran my last half marathon (my 6th overall) and ran a PR of 1:52:03 (8:34 pace). I am running another on Sunday and am hoping to PR, mostly because it would be good for my confidence for my upcoming marathon in January. The problem is that my training has been focused on the marathon and not the half. I looked back at my training for the last half and it is vastly different from what I am doing now. The main differences are:

Mileage- Last year I was averaging about 20-30 miles per week for the 6 weeks leading up to the race. Right now I have been averaging 30-40 miles per week for at least 8 weeks, probably more.

Distance of long run- Last year capped out at 10. I have at least 5 runs greater than 10 miles in the last 8 weeks.

Speed-the big one that has me nervous. At the advice of just about every experienced runner I have come into contact with, I have been trying to slow the bulk of my training runs. I am currently following Matt Fitzgerald's 80/20 intermediate plan. Most of my runs have been in the 9-9:40 pace range, with maybe 30 minutes per week at in increased pace of 8-8:30 (one tempo or fast finish run and one speed interval session). Last year most of my runs were in the 8:30-8:45 range. They were usually 6 miles or less. My longer runs were around 9:00.

Strength training/yoga-I was doing much more of it last year. Period.

Because I have done virtually no training at goal pace, I am concerned that I won't be able to achieve it. Based on your experience, is a PR for a HM realistic given my current training?