I have done five rolls of film so far using two-bath and I must say that I am very pleased with the results that I am getting. I do not see any issues with using slightly higher temperatures with this process. My apartment complex is a major heat trap, temperatures can soar rather high. The highest so far that I have developed was at 76.1F/24.5C and the frames look tonally awesome and sharp! I was afraid that the highlights may blow out because of the higher temperature and with no adjustment of time. I was doing temperature control until I stopped a little while ago, before I started Barry Thornton's process. It is a headache with temperature control and dealing with extra containers, ice cubes, limited space, monitoring, yadda yadda that it was taking the fun right out of the process and was a huge delay for me to get things going.
I was a control freak when it came to temperature for the longest time until I said to myself: "let me try this and see what happens". Before I did the two-bath process I was using time alteration by using the calculator from the MDC page for D23 at 1:1 and it worked great. When I finally got to using two-bath I realized there wasn't a compensation to use that would be really doable because times were really on the short end and I was reading to just use the prescribed times and do not deviate from 68F/20C. Again, I heard that voice saying to me: "let me try this and see what happens".
I have processed Kentmere 100 and 400 at 76.1F/24.5C, highest so far at this time, for 4 minutes and 5 minutes respectfully and I have to say that I don't see any negative issues, no pun intended. The grain structures look fine on both film speeds just like when I normally developed with D23 1:1 with slightly more sharpness which is probably due to the slightly lesser sulfite in the mix and my agitation is lesser than usual, much so with the Part B: No inversion the first minute and then one slow and careful twist every minute.