I think you can. As you say, it was close and I think you had Poon just below Lee before today's fights. Shimoda is a good fighter, but wasn't really regarded at world level and he's came in and dominated Lee. Also, unlike Lee, Poon had a solid record at world level before their fight and was generally regarded as the number 1 in the division alongside Nishioka.
No way Solis should be ranked ahead of Chambers. Wins against Peter, Dimitrenko and Brock are far better than wins against Austin and Barrett. Both of Solis' opponents were further past prime than Chambers'
Are we only going by official results and not who actually 'won' the fight then? Surely as it's our own rankings we can do the right thing?
Shumenov best win is a dodgy won over Campillo. Erdei was undefeated champion for 5 years, 12 defences. Moved up to win a belt at cruiser and has come back.